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  1. Trailer Brake Controller
  2. CURT
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  4. Time Delayed Controller
  5. Under-Dash Box
  6. Up to 4 Axles
Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed

Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed

Item # C51120
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Trailer Brake Controller
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Product Expert Kathleen M

Is this right For you? Product Expert Kathleen M says:

Yes, if you:

  • Have a hard time finding a spot to mount a controller in line with the direction of travel
  • Only need a basic controller that gets the job done and doesn’t break the bank

No, if you:

  • Have issues with your trailer brakes locking up
  • Haul a trailer with hydraulic brakes
Electronic controller activates electric trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness are easily adjustable. Includes easy-to-read digital display and manual override. Lowest Prices for the best trailer brake controller from CURT. Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed part number C51120 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (262)
  • Q & A (0)
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  • Why etrailer?

CURT Trailer Brake Controller - C51120

  • Electric
  • Time Delayed Controller
  • CURT
  • Under-Dash Box
  • Up to 4 Axles
  • Automatic Leveling
  • Dash Mount
  • 360 Degrees
  • Digital Display

Electronic controller activates electric trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness are easily adjustable. Includes easy-to-read digital display and manual override.


  • Brake controller activates trailer brakes with preset intensity
    • Signal is sent to trailer brakes when tow vehicle's brakes are activated
  • Adjustable, thumbwheel power output control lets you determine the amount of braking force
    • Set to maximum when you travel through hilly terrain with a fully loaded trailer
    • Back off the power output when you tow a lightweight trailer
  • Sync setting lets you adjust the aggressiveness with which the brakes are activated
    • Get full power output faster by moving slide-bar switch forward to increase activation speed
    • Achieve smoother braking by moving switch in opposite direction to supply power gradually
  • Easy-to-read digital display communicates brake force output, sync setting, and error codes
  • Self-diagnostics function monitors trailer connection and checks for shorts
  • Built-in, slide-bar manual override
  • Quick and easy installation
    • No need to mount level like proportional brake controllers
    • Mounting bracket and hardware included
    • Plug-in, vehicle-specific brake control adapter (sold separately) can be used for certain applications to reduce installation time


  • Application: trailers with up to 4 axles (8 brake assemblies)
    • Designed for use with electric brakes only
  • Limited lifetime warranty

Time-Delayed Braking

The Discovery applies your trailer's brakes when the brake pedal in your tow vehicle is engaged. Every time you apply the brakes in your vehicle, a signal is sent - via the brake switch - to the Discovery. The controller then sends power out to your trailer brakes to activate them with an intensity set by you, at a rate determined by you. Both the amount of braking power (output) and rate of application (sync) can be adjusted to suit your preference, the road conditions, type of trailer, and size of the load. To determine which levels are best for your application, you must test out your towing setup and choose what feels best.

A time-delay controller is so named because there is a delay between the time that you initially apply the brakes in your tow vehicle and the time that the controller reaches maximum power output. Unlike a proportional brake controller, which activates your trailer's brakes based on the deceleration of your tow vehicle, the Discovery sends power out in the same way, with the same gradual delay, no matter the braking situation. Although this delay always exists, it can be adjusted by changing the sync setting.

Built-In Controls for Adjustable Power

Curt Discovery Controls and Components

The above diagram shows the controls and components of the Curt Discovery trailer brake controller.

  1. Digital display
  2. Power output control
  3. Sync control
  4. Slide-bar manual override

Output Control

During the initial setup process, use the thumbwheel control on top of the Discovery to adjust the output. The output control lets you set the maximum amount of power that will be applied to your trailer's brakes. Typically, the output is only readjusted when you experience changing road conditions or if you switch over from a heavy, loaded trailer to a much lighter, empty trailer, or vice versa. To get more power to your brakes, rotate the switch to the right. To decrease the power output, move it to the left. The output setting will appear on the digital display when you press the brake pedal or activate the manual override. This setting ranges from 0 to 10, with 10 indicating maximum output.

Sync Setting

To adjust the aggressiveness of your trailer's braking action, use the slide-bar control on the side of the Discovery to change the sync setting. If you want to reach maximum power output faster, move the switch forward. To get smoother braking action, slide the switch backward, thus supplying power to the trailer brakes more gradually. You can alter the sync setting to suit your driving preferences or to improve handling based on changing road conditions or varied trailer loads. The digital display will only show the sync setting as you adjust it.

Quick, Simple Installation

Because inertia plays no role in the functioning of this controller, you do not have to mount the unit at any particular angle. As a result, mounting options are limitless, so long as you can still easily access the controller.

Installation of the Discovery requires that you either purchase a custom wiring adapter designed to plug into the controller or that you hardwire the controller directly into your vehicle. To hardwire the Discovery, you must remove the plug at the end of the integrated wiring harness.

Installation Accessories

For easier installation, a vehicle-specific wiring adapter (sold separately) is available for most newer trucks and SUVs. One end of the custom adapter plugs into your vehicle, and the other end plugs into the controller - no hardwiring required.

Note: If a custom brake control wiring adapter is not available for your vehicle, one of the following will be required:

20-Amp circuit breaker (9506P - sold separately) for 2- to 4-brake applications

30-Amp circuit breaker (38630 - sold separately) for 6- to 8-brake applications

See also's exclusive 7- and 4-way brake control installation kit (ETBC7 - sold separately) if you don't already have a 7-way plug at the back of your vehicle.

51120 Curt Discovery Time Delay Trailer Brake Control

Installation Details C51120 Installation instructions

California residents: click here

Customer Reviews

Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed - C51120

Average Customer Rating:  4.8 out of 5 stars   (262 Customer Reviews)

Electronic controller activates electric trailer brakes with a preset intensity when you apply the brakes in your vehicle. Power output and braking aggressiveness are easily adjustable. Includes easy-to-read digital display and manual override.


I finally got a chance to hook up to a trailer. Everything works fine. I figured it would. I had bought a Curt controller years ago (2006?) And pulled many heavy trails with no worries.
I was dismayed by the packing. There was so little bubble wrap in the box that the controller bounced around so much in its clear plastic that contents of that clear box were spilled out into the shipping box. Room for improvement there.

The controller great!. Works perfectly on my 67 Chevy C10
David - 03/31/2022


I am sure it will work, BUT I did not look close enough, I expected it to include the socket to plug the trailer plug into, not just a 5 pin socket. No info on what else I need to make the system actually work.

I can assist with finding the additional wiring that you will need. I do have a question that I need to ask. Does your Mazda have a factory tow package?
-- Etrailer Expert Jenny N - 05/20/2022
I do need to clarify. The most recent hitch is for the 91 Mazda B2200. It has the basic 4 pin lighting connector. I previously bought a hitch and wiring for my 2012 Chevy Equinox. and no it does not have the tow package either. The brake controller is for the Chevy Equinox. I did get that hitch mounted with no problem. and got the trailer lights connected and all works fine. The brake controller is for the chevy so that is the one I need the i7 pin connectors etc.for.
-- comment by: Frederick - 05/20/2022
I can definitely help on the 2012 Chevy Equinox. Since the Equinox did not come with the tow package and you have already installed the four-way harness then you will need the following part numbers to add on the brake controller. The first will be part # ETBC7
Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires
which is a kit that includes the parts that you will need to wire a 7 way into the Equinox. You can use the FAQ listed below to see what will be involved. The second part that you will need is part # C51515
Universal Wiring Adapter for Curt Trailer Brake Controllers
which will plug into the controller and then will be hardwired into the vehicle. There is an additional stop light switch, part # RM-751439
Roadmaster Stop Light Switch Kit - Chevrolet Equinox / GMC Terrain
, which may be necessary for installation as this vehicles stop light switch does not have a cold side to tap into.
-- Etrailer Expert Jenny N - 05/20/2022


Fits almost perfect


This Curt Discover controller works great. Super easy to install if you get the pigtail for your model truck. I especially like the fact that you can install the bracket under the dash on my new 2018 Silverado using factory screw under the dash. No drilling required. As always wonderful pricing and delivery from E-Trailer.


Fit nicely under the dash on the left side. Also installed a 7/4 pin connector in the bumper, replacing the blank plug from the factory(etrailer p/n HM40975-11998)


We purchased this for our 18 ft camper
is very good working brake system.
We did have a wire fray but no fault of the system. We called the help line and they helped us diagnose it . Customer service is very good****

Like it w
Bob w - 06/23/2021


I purchased this controller to install in my daughter's 2013 Ford Explorer. It is the exact same model as the one I have in my 2010 Ford F150. The "slide" adjustment on this one does not have as much resistance to adjustment as my original so setting it is requires a very delicate touch. I would probably would have asked for a replacement but I did not have time to make an exchange as she needed to use it right away. However, it appears to be operating fine and did not move from it's position once it was set. I would have rated it as excellent except for this one weakness.

So far it has been working just fine!
Peter - 06/23/2022


I have not received this package!!!

I will have Customer Service reach out to you.
-- Etrailer Expert Thomas M - 01/13/2022


Easy plug and play. The brake switch gets stuck when you slide it


I bought a new car dolly with electric brakes to pull with our motorhome ( Fleetwood FlAIR 2001 ) as all states require brakes on trailers at all different weight levels. I called E trailer and spoke with Danna and after talking with her about different models I choose the C51120 time delay control, as it can be adjusted to work well with the tow vehicle . I received the control with in 3 days of the order and went to put it in and found under the dash wire a harness by Fleetwood which told where each wire on the controller went on the harness. I was able to hook it up sitting in the drivers seat. Completed the hook up and started to test the operation, to find I was not getting the proper readings. I talked with Tom and he said he would bench test a like control and report back to me, at 6 pm he left a message on our phone that he believed the problem was along the blue wire to the trailer on the tow vehicle . I started at the back of the, motorhome and moved forward testing for a brake signal, I found that the butt connector had pulled apart and was not getting current to the plug in at rear of coach. Hooked it back together and re taped the wires and it works like a charm. I want to thank all off you for the prompt and knowledgeable service, I would recommend E trailer to anyone who wants to deal with a great staff and company Thank you

I used this controller to pull ma car dolly to AZ and back through all the mountains and it worked GREAT I am very happy with how it worked Great product
Bob R - 02/04/2017


the brake controller with all the wiring plus the 7 pin plug was better than i thought . it even has great instructions and easy to read. the price was good . the 7 pin plug even has the 4 pin connector mounted in with it very glad that i bought it is everything that you need to make it work . everything about it is excellent very glad that i found it here at a good price . even fast shipping . again thanks for good product

Use it for pulling camper works great even a good price fast shipping . Its been a year and still working great.
George D - 10/16/2016


Parts were right, the web site helped to install. Great all the way around. Thanks.


Great product worked perfect!


I was very impressed the the speed at which I received my order. The part worked perfectly on my vehicle.


Great service and communications.


This is by far the most pleasant buying experience I’ve ever had online. A wealth of information is provided for installation coupled with prompt delivery makes shopping for anything RV related a no brainer for me. etrailer is wonderful and have already started recommending this website to anyone I know.

No issue yet to date. Controller worked perfectly during last year’s RV season!
Erik - 04/01/2020


tracking sucks


After reading the reviews of this product I decided to give it a try myself, with a great price. When I received it within a week along with the plug and play 7 prong trailer hitch adapter, I realized I was missing something. The plug and play adapter for this product. It showed me it when I was buying and for what ever reason I didn't have the option to add it as well. It was very easy to install, like I said plug and play. The problem is it does not work. followed all the directions, double checked everything I just don't have a signal to the trailer from the break controller. Good luck


Less than 1 yr after installing on a 2017 F250, controller quit working right. It would surge brake to some high number like 7 (10 being max) regardless of the controller setting which would lock up trailer brakes. Next time it would only allow a setting of 2.5 or 7.5... nothing else. Next time it would do something different. Called Curt who recommended unplugging it for awhile. Worked for awhile then started acting up again. They're going to send me a replacement. Tbd if replacement will be better.


Ordered a brake control and an inline circuit breaker on Feb 11th and shipped the same day. I chose the least expensive shipping option (my bad). A combination of UPS/US Post Office, or so I was told after calling to find out where my shipment was. Tracking info said delivery by the 15th. When it didn't show I called etrailer and was told the post office had it and it was out for delivery...2 days later I finally received it (Feb 20th). I ordered a hitch a couple of weeks prior and received it in 2 days. A 49lb hitch vs a 1lb (maybe) package. Not etrailers fault but I can see why the post office is going broke with service like that!


When i needed to replace my electric brake controller on my truck for pulling my trailers I first ordered from another dealer and when i got the unit and read the instructions there were about 3 items that i wasn't told about and sent it back ,so i kept searching for the controllers and came across e trailers , there were so many questions i had from my researching that when i called e trailers and talked with Preston he was so helpful in explaining the differances with controllers and i explained what i wanted and why he helped set me up with the right one .I then ordered the unit it was received faster than i expectided , it took me about 20 minutes to install the wiring harness and controller, I'm very happy with the customer service rep. Preston with help and time to explain and the choice i made thanks Preston and E trailers


It was easy to hook up and mount on my truck. It is just what I wanted.


good products and fast shipping


Installed the Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed - C51120 in our 1982 GMC 1-ton dually to activate the brakes on our Forest River Sandpiper Sport SP34T 34' triple axle toyhauler travel trailer...
The Curt Discovery Trailer Brake Controller installed easily, adjustment was fairly painless and it performed flawlessly on a recent 600 mile trip.
We would definitely recommend this product and!

After 1 year we are still completely satisfied!
Drew V - 10/10/2017

Show More Reviews

Ask the Experts about this CURT Trailer Brake Controller

  • Turn Signals Work But Brake Lights Do Not Light Up
    You came from a brake controller page when you asked the question. Is this issue related to the installation of the brake controller? Or are we just talking about brake lights on a trailer or vehicle? If it is on the trailer then usually there is a bad ground connection since the brake lights draw more constant power than the turn signals. Make sure that the vehicle side and trailer side connectors are clean and free of corrosion inside and out. The main connector grounds should be attached...
    view full answer...
  • Which is Better a Time Delayed or Proportional Brake Controller
    Between the two controller I would go with the proportional Curt Triflex part # C51140 over the time delayed Curt Discovery part # C51120. A time delay controller is so named because there is a delay between the time that you initially apply the brakes in your tow vehicle and the time that the controller reaches maximum power output. Unlike a proportional brake controller, which activates your trailer's brakes based on the deceleration of your tow vehicle, a time-delayed controller sends...
    view full answer...
  • Troubleshooting Flashing Display of the Curt Discovery Brake Controller part # C51120
    The flashing O.L. message with the Curt Discovery Brake Controller part # C51120 when there is no trailer connected indicates that there is a short somewhere on the brake output circuit. I would check all the connections you made on the blue wire from the controller and then also check the trailer connector at the rear of the vehicle looking for any exposed wire or corrosion and fix as necessary. If it only flashes O.L. when the trailer is connected the problem is the same as above but...
    view full answer...
  • Tapping Into Brake Light Circuit to Install Brake Controller In a 2011 Chevy Equinox
    On a 2011 Chevy Equinox you cannot tap into the brake light switch to install a brake controller. You have to get the signal from the BCM (body control module). It is located up under the dash to the left of the brake pedal. There is a 26-pin connector. You need the wire in position 11. It should be a white wire. I have included a picture that should help. I have also included a link to another answer page to the right that also has that picture.
    view full answer...
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  • How Is Curt Time-Delayed Brake Controller Installed
    Many vehicles designed for towing have a port located under the dash that you are able to use for installing a brake controller like the Curt Discovery Trailer Brake Controller, part # C51120. There are adapters available for some vehicles and other vehicles will require hard wiring when installing. I have attached a product review video for the Curt Brake Controller you can take a look at. I have also attached a couple of helpful articles that explains brake controllers and their installation...
    view full answer...
  • Troubleshooting Brake Controller that Doesn't have 12 Volts on Red Wire when Brakes are Applied
    The red wire of the controller needs to be showing voltage when you apply the vehicle brakes otherwise the controller is never going to activate when you apply the vehicle brakes. You need to verify the circuit you are trying to connect that wire to has 12 volts when the brakes are applied. Issue could also be the connection isn't being made completely and you'd just need to make the connection better.
    view full answer...
  • Troubleshooting Intermittent Brake Controller Connection to Trailer
    What is the controller flashing? That might help narrow down what the issue might be. You might also just have a dirty trailer wiring connector. Try cleaning the pins on the 7-way on both the truck and trailer to see if that cleans up the connection and allows it to work consistently. I also attached a help article on brake controllers for you to check out as well.
    view full answer...
  • Troubleshooting Trailer Brake Controller that Only Functions When Engine Isn't Running
    That is an interesting problem you are having, but the problem lies somewhere in the wiring of the brake controller/7-way. The only way a brake controller is going to work properly with the key in the ACC position but not when the vehicle is running has to be due to wiring. Check to make sure there are no shorts between the two wires you ran to the rear of the 7-way. It sounds like you ran a wire for the 12 volt accessory circuit and an additional wire for the brake output. You might...
    view full answer...
    Image 1 for
  • Curt Discovery Brake Control Flashing 0.0 Troubleshooting
    The troubleshooting guide included in the instructions for the Curt Discovery Brake Controller # C51120 that you referenced does not include this particular display issue, a flashing 0.0, among the possible display messages. My technical contact at Curt has never seen this particular message displayed on a Discovery brake controller. He suggested that either the display is malfunctioning or the controller is bad. Since your brakes are not engaging when you press the pedal with the trailer...
    view full answer...
  • Troubleshooting Aggressive Trailer Braking with Curt Discovery on a 2018 Chevy Silverado 1500
    Have you tried going different speeds when you are adjusting the power output of the Curt Discovery Trailer Brake Controller # C51120 on your 2018 Chevy Silverado 1500? If you are only testing it at a slow speed and the brakes on your trailer are already set to be aggressive then it wouldn't take very much for your trailer to brake. Try putting the power output at the lowest setting for the Discovery, test it, and then go to the highest setting and see if that makes a difference. Let...
    view full answer...
  • Troubleshooting Trailer Brakes that Lock Up When Trailer Is Connected
    There is a short or a mis-wire on the 7-way you installed. It sounds like the 12 volt accessory circuit is shorting out to the brake output circuit which is causing the brakes of the trailer to lock up anytime the 7-way is connected. This is a fairly common issue as wiring up connectors is a bit confusing. Since the controller never senses a connection it sounds like the problem is the circuits just being wired backwards. I attached a chart that has what the 7-way pin out should look like.
    view full answer...
    Image 1 for
  • Troubleshooting Brake Controller that Only Works with Manual Override Lever
    This is a fairly common problem and the solution is the red wire of the brake controller. Make sure it is connected to a circuit that only sees voltage when the brakes are applied and none when released. Most likely the connection is the issue and just reconnecting the circuit will cause the controller to work again. You can also check to make sure that the third brake light fuse is in good condition under the hood of the vehicle as well.
    view full answer...
  • Curt Discovery Brake Controller Displays Decimal Point When Not Connected To Trailer
    The Curt Discovery Trailer Brake Controller - 1 to 4 Axles - Time Delayed, # C51120, is working properly. It is designed to display the decimal when no trailer is connected and number when connected. The numbers should increase as you activate your manual override when connected to the trailer as well. I have attached the installation details for you and a video to help.
    view full answer...
  • Troubleshooting Brake Controller that Only Works with Manual Override Lever
    The issue is related to the stoplight circuit that the brake controller connects to with it's red wire. The red wire of the controller needs to connect to a circuit on the vehicle that only sees voltage when the brakes are applied. Most likely the red wire lost connection to where it was installed or you blew a third brake light fuse which killed this circuit as well. I also attached a help article on troubleshooting brake controller installs for you to check out as well.
    view full answer...
  • Is it Normal for Curt Discovery Brake Controller to Send Constant Power Without Trailer Connected
    The 12V power that you are getting on the brake controller (5 o'clock) pin of your 7-Way from the Curt Discovery Trailer Brake Controller # C51120 is actually normal. The Discovery sends back power to that pin to sense when a trailer is connected. Once you connect your trailer it senses this and won't send that constant power. I confirmed this with my contact at Curt.
    view full answer...
    Image 1 for
  • Troubleshooting Brake Controller Install Where Brakes Lock Up As Soon as Brake Pedal is Touched
    Since your controller is not showing a connection and your brakes are locking up anytime the brake pedal is touched that means that instead of having the brake output circuit connected to the trailer brakes (blue wire of controller) you have a stop/turn signal circuit connected to the circuit instead. You can test this pretty easily by turning on either blinker and you should feel the trailer brakes lock up with the blinker getting activated. Since your brake controller would have been...
    view full answer...
    Image 1 for
  • Odd Error Code on Curt Trailer Brake Controller
    I can give you some general troubleshooting but unfortunately I was unable to find the Curt brake controller you ordered from us and none of the manuals I looked in for Curt controllers like the Curt Discovery Trailer Brake Controller # C51120 have 3.5 or 35 as an error code. Occasionally some Curt brake controllers have odd error codes that are fixed by doing the old "unplug it and plug it back in" maneuver.
    view full answer...
  • How to Properly Set Up Curt Discovery Time Delayed Brake Controller
    To properly set up the Curt Discovery brake controller part # C51120 you first need to set the max output setting with the thumbwheel (number 2 in picture) on top of the controller. You want to adjust this to a setting that when you slide the manual override lever (number 4) all the way grabs the brakes as hard as possible right before locking up. Once that's set the next setting is the sync setting (lever on side number 3) which controls how fast the brake pressure ramps up to full pressure....
    view full answer...
    Image 1 for
  • Testing Curt Discovery Trailer Brake Controller With No Display
    It is possible your Curt Discovery Trailer Brake Controller # C51120 is faulty, but first, just double check all your connections and specifically ensure the black and white wires are not reversed. Also take another look at your circuit breaker to make sure it is not blown, but if everything but the display is working, that would indicate a problem with the unit.
    view full answer...
  • Help! Curt Discovery Trailer Brake Controller # C51120 Only Shows Decimal When Brake is Applied
    Since the Curt Discovery Trailer Brake Controller, # C51120, is still displaying the decimal when the trailer is connected, the controller is not sensing a connection with the trailer brakes. In this case the issue is most likely related to a wiring problem or brake magnet problem. I would start by making sure that there isn't any corrosion in either connector. Next, I recommend using a circuit tester like part # 40376, to make sure that you have power on the brake controller output pin...
    view full answer...
  • Which Brake Pedal Stoplight Switch Does Red Brake Controller Wire Connect to on 2013 Ford Escape
    The second generation Escape (2008-2012) used a purple and white wire for the stoplight switch, but I could find no information about your 3rd generation Escape. The best way to find the correct wire is to use a circuit tester like part # 40376 and test each of the wires. The wire that only goes hot when the brake pedal is pressed (not with the headlights or turn signals) is the wire you want to tap that red brake controller wire into.
    view full answer...
  • Will the Curt Custom Brake Controller Adapter # C51322 Work with a 1998 Lincoln Navigator
    The Curt Custom Wiring Adapter, # C51322, was designed to work with the factory brake controller plug on your 1998 Lincoln Navigator. The pin for the red wire coming from the brake controller should mate with the pin for the light green wire on your factory plug. It will be the middle pin and on one side you should have a pin with constant 12 volt power and the pin on the other side should have no power. I have attached a photo that shows the functions of each pin on the custom wiring adapter...
    view full answer...
    Image 1 for
  • Brake Controller Wiring Adapter for a 2015 Toyota Tacoma with Factory 7-Way
    No worries, the 5-wire harness will work just fine because the extra connection is for the illumination circuit and it's not needed. The Curt Discovery trailer brake controller # C51120 is a fit for your 2015 Toyota Tacoma and the direct fit pig tail adapter # C51362 you referenced is correct. You will simply plug the adapter # C51362 into your factory brake controller tow port and route the pigtail to the location of your choice so you can connect your brake controller # C51120. I...
    view full answer...
    Image 1 for
  • Curt Brake Controller, Wiring Harness 1999 F-350 Super Crew
    The Curt brake controller # C51120 can plug directly into your 1999 F-350 Super Crew using the proper wiring harness, # C51322. This harness is sold separately. I have included a link to a video to the right that shows where the connection point on a similar truck. The brake controller and harness are different in the video but they plug into the same place on the truck.
    view full answer...

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