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FITS 2005 Toyota Tundra
Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector

Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector

Item # 20137
Retail:$72.36
Our Price: $46.29
You Save: 36%
Custom Fit Vehicle Wiring
Confirmed to Fit
2005 Toyota Tundra

with factory 7-Way

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To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.

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Tekonsha Trailer Hitch Wiring - 20137
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The best technical support and full custom fit vehicle wiring installation instructions. Great price Tundra custom fit vehicle wiring and expert service. Toyota Tundra, 2005 custom fit vehicle wiring by Tekonsha are available from etrailer.com. For expert service call 1-800-940-8924 to order your Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector part number 20137, or order online at etrailer.com.
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  • Reviews (102)
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2005 Toyota Tundra - Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector

  • Custom Fit
  • Trailer Hitch Wiring
  • 4 Flat
  • 7 Round - Blade
  • No Converter
  • Tekonsha

Tow Ready replacement 7-way flat pin and 4-flat combo adapter harness for Toyota Tundras with a factory socket.


Features:

  • Ability to tow trailers with different style trailer connectors
  • Durable plastic shell
  • Provides both a 7-Way and a 4-Way covered trailer connector
  • Mounting bracket included


Wiring Diagram

Notes:

  • Vehicle must have the factory 7-Way in order for this harness to fit.
  • Toyota wired many vehicles two different ways. You will want to match the wiring with the diagram on the 3-pin connector above. If your vehicle's wiring does not match the diagram above, you will need to consult our vehicle application guide for other vehicle specific wiring options. Hardwiring might be necessary.



20137 Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector

Installation Details 20137 Installation instructions

California residents: click here


Video of Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Tekonsha Custom Fit Vehicle Wiring - Trailer Hitch Wiring - 20137 Review

Speaker 1: Today we're going to take a look at the Replacement Multi-Plug 7-Way and 4-Way Trailer Connector.Now, this is a custom-fit part. It is designed to fit the 2003 to 2006 Toyota Tundra trucks. This part will give you the ability to tow trailers with the different style trailer connectors. Your vehicle must have the factory 7-way in order for this harness to fit. This'll plug right into the connectors that are on your vehicle. If you notice, the 7-way is in a nice, durable, hard plastic shelf for protection.

This does provide the 7-way connector, has a spring-loaded cap with the seal on it to keep any dirt or grime from getting into the connectors, and it also has this 4-way, which has a nice dust cover over it also to protect the terminals when you're not using it.All this is included that's shown on the table. The mounting bracket and the hardware's all included to install this to your vehicle, and a nice set of detailed instructions.But, basically, all you have to do is take your mounting bracket, slide the cords through there, bring that up. You'll notice the four holes will line up just like that, and then you'll have two at the top that you're going to attach to your vehicle, but also it's nice, you notice there's a cut-out there, and it's made specifically for the 4-way to stick right in there. You just slide your 4-way in there and that'll be at the back of your vehicle. You have access to the 7-way and then the 4-way right over here.But that should do it for the review on the Replacement Multi-Plug 7-Way and 4-Way Trailer Connector..

Customer Satisfaction Score:


Customer Reviews

Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector - 20137

Average Customer Rating:  4.5 out of 5 stars   (102 Customer Reviews)

Tow Ready replacement 7-way flat pin and 4-flat combo adapter harness for vehicles with a factory socket.

by:

The connection came deformed and needed considerable work to make it fit the OEM truck side. Packaging was not damaged. This was a manufacturer quality issue. While I got it to eventually work, it was disappointing that it needed so much time and attention to make the connection.



by:
2006 ToyotaTundra

Easy to use site and product came well rapped and on time.

Frank

3/17/2024

Perfect - no problems- easy to install



by:

Package arrived promptly - as expected - all in good shape. All hardware (screws, bolts etc.) included. I haven't had a chance to install it but am confident it will work just fine.



by:
Lexus GX 470

Product over all is a nice unit. Turns out though there is 2 different options for the GX470 and I didn’t realize. Make sure you look to see which one is correct. This one wasn’t the correct one I needed, put in my order for the correct one after realizing. Only way to know is to get under and look at the plugs on your vehicle. This one has one female plug(4pin) and one male plug(3pin) so make sure you are ordering the correct one



by:
2005ToyotaTundra

I replaced the 7-way trailer connector harness with this product. I own a 2005 Tundra. The original connector was damaged when I backed into a rock I didn't see. This product is superior to the stock connector, for several reasons: [a] it also includes a 4-way connector, which increases towing flexibility, [b] overall, it is more robust than the original (in my opinion), and [c] the wire harness is better integrated into the connector, which prevents water and dust intrusion. The wiring harness is shorter than the original, but the end plugs connected [new male to existing female] without issue - although the stock wire bundle holding strap positions could not be used. In fact, based on the fit, I abandoned the holding straps altogether. Contrary to one reviewer, who questioned whether the plugs would remain connected due to the stretch, the plugs snap together. As several other reviewers have mentioned, the bracket holes are misaligned slightly and are too small for the stock bolts. By drilling these holes out with a 5/16 bit, the fit is nearly perfect. The product sheet implies the connector is an add-on [as evidenced by the included self-tapping screws], not a replacement, as advertised. Regardless, this is a quality product that installs easily and quickly for the DIY customer with basic tools. In addition, it saves a bundle of money in avoiding a purchase at a dealership ! ! ! I just checked with my Toyota dealer and they wanted just over $200, and that's with a 10% discount.

Jan

10/22/2015

Still working exactly as advertised no problems whatsoever ! !



by:
2003 Toyota Sequoia

The product was good quality. Loved seeing the install video before purchasing. The only complaint I have is the wiring harness was too short for 2003 Toyota Sequoia. I could not attach the bracket back to the metal where the oem plug was. I had to drill holes into the plastic bumper and barely bypasses the hitch bar.

Jason P.

8/24/2018

I had to remove this product and reinstall the old wiring. In all fairness, it may have not worked due to the previous owner messing with the truck wiring. It didn’t work for me. However I would still recommend the product and believe it would work well on an OEM install.



by:

George J, Nathan S, Katie The replacement multi-plug 7-way and 4-pole trailer connector was just as I excepted.

I will always use etrailer for any trailering needs.

Good quick service.

Hewell W

James H.

7/15/2013

I have a 2004 Toy Tundra 4.7 Quad cab with factory installed tow kit. Want to replace light harness kit as trailer lights are not functioning and man at trailer shop with a tester said no power is coming out of trailer plug on truck to boat wiring.

Patrick B.

7/16/2013

If your Tundra has the factory 7-Way connector then this would work. It would be worth the time to check the fuse blocks and see if any of the towing fuses are blown. Also, check the connections on the harness and make sure they are clean and clear. If fuses are blown or connectors are dirty or corroded, a new harness may not help.


by:
2003 ToyotaTundra

The product was easy to install. One minor alteration was needed. I had to enlarge both of the mounting holes ever so little. Just a few runs with a small rat tail file did the trick. It is sturdier built than the OEM. All the pigtail wiring was flawless on the product. No more trouble shooting when I switch trailers back and forth. Also, I no longer have to use an adapter when switching between 7way and 4pole wired trailers. HIGHLY RECOMMEND IT.



by:
2006 ToyotaTundra

Looks solidly made with correct connectors.
Bracket
fitted existing bracket on frame though the holes on bracket did need to be drilled out to 1/4" to accept existing bolts.
Connectors are correct but the harness is quite a bit shorter than original. The connectors do not have slot for existing cable holder so cannot mount to existing frame cable holder. Check harness not damaged when spare tire removed.
Original had the tabs [Tail lamp, left turn and stop etc.]labeled on the the cover. Would be neat if Tekonsha had a similar molding as it would apply to all its seven connector devices. However could at least add a printed card with a diagram. Takes the guess work out of circuit checking.



by:
2003 ToyotaTundra

I received my 2003 Tundra trailer wiring pigtail in short order which is a pleasant surprise. I haven't installed it as yet because I haven't been able to get the old one off as yet. I'm scheduled for an appointment with Toyota for an oil change and they will take the old one off. But I have compared the new one to the old one and it appears to be an identicall fit. Now instead of having a seperate 4-way flat hanging down I'll have one attached to the 6 way plug. My complements on the quality and fit of this item.



by:
2006 ToyotaTundra

Solid product. Harness connectors were spot on. I replaced a factory 7 pin connector. There are two areas for improvement. First, the bracket mounting holes were slightly smaller than stock and had to be drilled out a little. Also, the spacing was off about a 1/16", but the drilling took care of that. 2nd, the harness is about 3 to 4 inches shorter than stock, so the original wire loom holding strap positions could not be used. Otherwise, great connector. The 4 pin flat connector is a great addition!



by:

Connected to the vehicle wiring harness with no problems. While attaching the base unit to the vehicle, I had to attach it to the bumper which is plastic, so I used a stiffener to the bottom of the bumper. It was easier to pre-drill the stiffener to the unit on the floor for ease of mounting unit to bumper. It was mounted left of the hitch and it looks very good not to say so myself. Barrie B GYSGT USMC Quantico Va.



by:
2012 Toyota Sequoia

Product is super but...
It did NOT fit
on my 2004 Sequoia without my needing to move the location from the original. After reading the other reviews, I bought it assuming that if I removed the original wire holders, it would stretch and still plug in. Mine did not. My original wires were 24 inches long, these are 12 inches. That is a big difference.

The folks at e-trailer were great but in the end, I did have to relocate my plug.



by:
2010 ToyotaTundra

First, let me say, I don't usually write reviews... However, this product rocks. My used Tundra had a broken multi-plug and I was thinking about heading out to a junkyard to get a replacement as Toyota wanted +$150.00 for a new part. I found etrailer online and ordered it. Other than having to drill out the two holes in the bracket that mounts to the bottom of the bumper, the install was flawless and easy (less than 10 minutes). I have already told two friends about etrailer, and I will be shopping here again if/when I need additional trailer accessories.



by:
2005ToyotaTundra

Works well. One complaint would be that I wish it was a little longer for use with the socket tekonsha mount as my controller stays in the box of the trailer. It is a shared trailer and there is no point to buying two separate controllers.



by:

I purchased this harness to replace the OEM harness that broke off. The replacement harness was well built and installed easily. I just had to oversize the bracket holes because I was using the original hardware. If the spring loaded cover had a rubber weather seal it would have got a 5 star rating. Great product!



by:
2006 ToyotaTundra

Great product! Easy to install and has worked great. My factory wiring harness had shorted out and once I got it off it was on with this one in no time. I really like having both the flat and round plugs so I don't have to worry if I don't have my adaptor for some reason.



by:
2004 Toyota 4Runner

Please ensure that you check your plugs if you already have a factory 7-pin adapter. I have a 2004 4Runner and after starting the install I discovered the plugs on my vehicle (4 and 3 pin) did not match up properly with the adapter. The four pin plug worked but the 3 pin adapter was incorrect for my vehicle model. The adapter end was exactly the same as the one on my vehicle (I believe male to male connector). I called support and it looks like they make two different wiring configurations. 1 model has the 3pin male and the other model has the 3 pin female.

I spoke with customer service (a nice young lady) and we were able to get the order setup for the right part (HM43374).



by:
2003 ToyotaTundra

This product did the job in replacing the factory wiring harness. I only had to modify the mounting holes spacing slightly by drilling out the holes to accept the original screws. The supplied mounting screws were much less substantial than the originals and did not fit the nuts that held the original harness. The job took about 30 minutes.



by:
2004 ToyotaTundra

Harness was super easy to install. I did tweak the install by using better screws than what were provided for the frame. I used self tapping screws that were much larger. The only troubles I had was unplugging the part on the Truck but the new parts plugged right in. No more round adapters to use anymore.



by:

Never used it. My vehicle does not have the same connections as this harness.

Etrailer Expert

Mike L.

5/11/2019

This connector isnt a fit for your vehicle, a Toyota FJ Cruiser. its a fit for a 2003-2006 Toyota Tundra.



by:
2004 Toyota Sequoia

I purchased as replacement wiring for a 2004 sequoia truck. Although the connectors are correct, the wiring is too short. Either you need to change the location of the housing box or add 9 inches of cable. Would not recommend purchase.



by:
2005ToyotaTundra

This harness fixed my problem. The OEM harness got some salt water in it and was causing my trailer lights to not work. The mounting bracket that attaches to my 05 Tundra was a little off but was easy to fix with a drill.

Great product and the built in 4 way is very nice, i don't have to use the 7 Way adapter anymore.



by:

Works perfect, exactly what I need for my custom off road rear bumper that doesn’t allow for traditional mounting. Great price, fits exactly as they described.



by:
2004 ToyotaTundra

I backed into something with my old Tundra truck and destroyed the 7-pin trailer connector. Toyota wanted $292 for a replacement! I got this one for about $50 with shipping. It seemed to be high quality and was a plug-and-play replacement. I highly recommend it.


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Show More Reviews

See what our Experts say about this Tekonsha Custom Fit Vehicle Wiring

  • Replacement 7-Way Trailer Connector for a 2007 Toyota Tundra
    From what I could find, the 2007 Toyota Tundra used a harness like the 2006 model, # 20137. However, the plugs in this replacement connector do not sound like what you are describing. What you are describing sounds like the harness for the 2008 to 2010 models, # HM11143395 that you have referenced. Also, for a 2007, I found that a harness like # 54701-004 will fit and it has connectors like on # HM11143395. You will need to examine your connectors closely to determine which one, # 20137...
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  • What Parts are Need to Add a 7-Way Trailer Connector to a 2001 Toyota Tundra
    I do have a solution for you. In order to add a 7-Way wiring harness to your 2001 Toyota Tundra, you will need to start by adding a 4-Way, # 118378, if you need one. I have included a link to the installation instructions for this harness for you to view. With a 4-Way installed (or using an existing 4-Way if applicable) you will then need to install a 4 and 7 Way Installation Kit, # ETBC7. This kit includes everything you will need to install a functioning 7-Way on your truck. I have included...
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  • Factory Trailer Connector on 2006 Toyota Tundra Has Running Lamp and 12-V Circuits Reversed
    We see this every now and then with Toyota and Nissan trucks for some reason. It sounds like your running lamp circuit and the 12-v feed are reversed. The easiest thing to do is just rewire the connector on the truck, so your connector will be correct in case you ever need to tow anything else. I'll link to our trailer wiring help article, which will show which terminal on the back of the truck's 7-way serves which purpose.
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  • 7-Way and 4-Way Trailer Connector for a 2004 Toyota Sequoia with 7-Way and Different Pin Out
    For your 2004 Toyota Sequoia you would want the part # 20137 to give it a 7-way and a 4-way. We have heard of the pin outs on the connectors being different so what you would need to do is cut the wires of the connector so that they match what your vehicle has. I wish we had a separate connector for the different pin outs but at this time we do not.
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  • How to Safely Tow a 2019 Jayco 3,750 GVWR Trailer with a 2006 Toyota Trundra
    Since your Tundra is rated to tow your trailer the only thing I really recommend going with, if you already have a hitch like part # 13184 and wiring like part # C59236 or # 20137, is a weight distribution (WD) system. This will not only level your towing setup but it will also improve the handling of your trailer if you choose a system with integrated sway control. The best WD system for any towing setup will have a tongue weight (TW) range that the total tongue weight (TTW) of your towing...
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  • Troubleshooting Trailer Turn Signals Not Functioning After Install of ETBC7
    Unplug the 4-way of your vehicle and check the pins of it. Most likely there is corrosion on a few of the pins that will need to get cleaned off. Nearly everytime this problem comes up the issue is just corrosion that needs to be cleaned off. Or, just connectors that aren't perfectly seated together. If that doesn't fix the problem test the 4-way of the wiring harness with a circuit tester part # PTW2993 for voltage on all of the right pins when the taillight signals are being applied....
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  • Trailer Brakes of 23 Foot StarCraft Hybrid Travel Trailer Intermittently Lock Up
    Since you've had the brake controller, brake magnets and wiring adapter pigtail replaced, I think it's safe to rule out each of those components. You've had somebody tow the trailer around with a different truck without the problem being recreated. Is it possible for you to tow a different trailer that's equipped with electric trailer brakes using your truck? This would effectively rule out your truck as being the problem. The fact that the problem you're experiencing is intermittent...
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  • Will the Tow Ready Multi-Plug # 20137 Replace a Powered Converter on 2003 Lexus GX470
    Tow Ready tells me that most likely the 20137 will work on your Lexus GX470. You can confirm this before purchasing by having a helper activate the various lighting functions while you test the connectors under the vehicle with a circuit tester like part # PTW2993. Activate the left turn signal and test the various pins on the connector. You should locate one pin that will make the tester light up. Do the same with the right turn and the running lights. If this checks out, the 20137 will...
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  • How To Determine Functions of 2005 Toyota 4Runner OEM Trailer Wiring Harness
    In order to know what wires on the new vehicle-end connector will connect to which wires on the OEM harness, you will want to use a circuit tester, like # PTW2993, to test the wires in the OEM harness for their functions. Once you know the wires functions, you will want to connect them to the new vehicle-end trailer connector by function. It is easiest to test the wires functions if you have a helper who can sit in the driver's seat and activate the turn signals and other lights as needed...
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  • Recommended Wiring Harness for 2006 Toyota 4Runner
    We do have replacement connectors available for your 2006 Toyota 4Runner, all of which will provide both a 7-Way and 4-Way flat connector. If you have a 3-pin plug and a 4-pin plug at the rear of your vehicle, then you will need either the Tekonsha # 20137 or the Hopkins # HM43385, depending on how they are pinned. The issue is that Toyota wired many of their vehicle models during these years in two different ways. You will need to match the wiring with the diagram on the 3-pin connector,...
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    Image 1 for Image 2 for
  • Troubleshooting Trailer Llights for 2004 Toyota Tundra
    If you already have a 7-way connector on your 2004 Tundra, then you would simply plug in the trailer. If you have the 7-way and the trailer is a different compatibility, you can use adapter # HM47570. If you have the factory connections but are missing the trailer connector, then you would use the Hopkins Plug-In Simple Vehicle Wiring Harness for Factory Tow Package - 7-Way and 4-Flat Connectors # HM43385 or the Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector # 20137. Both...
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  • Availability of a Replacement Trailer Wiring Connector for a 2003 Toyota Tundra with Tow Package
    The Tow Ready Wiring Harness, # 20137, will connect to the factory connectors on the 2003 Toyota Tundra, but the receptacle does not fit in the factory location. This is the only replacement harness that we offer for the 2003 Toyota Tundra. I have included a link to the installation details for you.
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  • Where Is Factory Trailer Brake Controller Port In 2008 Toyota Sequoia?
    Assuming that your 2008 Toyota Sequoia has the factory 7-way connector, the factory trailer brake controller port will be above the emergency brake pedal. Removing the driver side kick panel will allow you to easily find the connector. Now if your Sequoia does NOT have a factory 7-way connector then you will need to first install a 4-way connector using # 118412, and then add a 7-way connector using # ETBC7. You will need to hard wire the controller if this is the case, as the port is...
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  • Recommended Trailer Wiring Harness for 2006 Toyota Tundra with 7-Way and 4-Way Connections
    The 7-way on your Toyota Tundra can be replaced with the Replacement Multi-Plug 7-Way and 4 Pole Trailer Connector # 20137 to give you both the 7-way and 4-way functions. Your other option is to add a 7-way to the bed of your truck for your camper connection using the Curt 5th Wheel/Gooseneck Wiring Harness 7-Pole # C56000. You will be able to use them simultaneously.
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  • Replacement 7-Way Trailer Connector for a 2004 Toyota Tundra with Factory Tow Package
    I have included a picture for you that will help. On your 2004 Toyota Tundra, find the connector under the truck that # HM43385 would plug into. Then use a circuit tester, # PTW2993 if you do not have one, to test the pins on the 3-pin part. The pins should be a mirror opposite of what you see in the picture. If they are not you would need to use # 20137 instead. The wiring harness part of either of these connectors should be plenty long enough to mount the connector where you need to....
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    Image 1 for
  • Replacement 7-Way Recommendation for a 2006 Toyota Tacoma with Factory 7-Way
    I have a solution for you, but it will require a little wiring and it is not the Trailer Wiring Harness part # 20137. There currently isn't a plug and play replacement 7-way available for your 2006 Toyota Tacoma so the best recommendation I can make would be to get the 7-Way Prewired Car Connector part # 20023. You will need to remove your current 7-way and bracket and cut the wires from the harness and wire them by function to the wires of the # 20024. I attached a picture that shows...
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  • Replacement 7-Way and 4-Way Trailer Connector for a 2007 Toyota Tundra
    We do have a replacement 7-way and 4-way trailer connector for the 2007 Toyota Tundra, but before we can determine which harness will work for your truck, we will need to know what type of plugs your trucks tow package wiring requires and how the connectors are wired. Unfortunately, Toyota decided to wire this truck a number of different ways. The Tundra had a generation change between 2006 and 2007 and this caused some discrepancies in the wiring. Your factory 4-way and 7-way trailer...
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    Image 1 for Image 2 for
  • Only Right Turn/Brake Lights Work After Installing Trailer Wiring Harness on a 2003 Toyota Sequoia
    In order for the trailer connector # 20137 to work, your 2003 Toyota Sequoia would need to have been equipped with a factory 7-Way trailer connector. If it never had a factory 7-Way, even though the connection points are there, the harness will not be fully functional. You may be able to take the vehicle to a dealer to have the missing components installed to make it fully functional. Also, it is possible that some relays or fuses would need to be installed in order for the connector to...
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  • 4-Way Recommendations for a 2005 Toyota Tundra Towing a Small Kayak Trailer
    For just taillight functions all you would need would be a 4-way trailer wiring setup. Which if you don't have a 4-way on your 2005 Toyota Tundra you could install the part # 20137 and you would end up with both a 4-way and a 7-way at the rear of your vehicle. If you are looking for a connector for your trailer with a lead you would want the # A35W42B which is a 4-way with 35 feet of 4-way wiring.
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  • Troubleshooting Trailer Running Lights After Installation of Light Kit
    Often when trailer lights funtion except the tail or running lights the issue is a bad ground. Unlike stop and turn lights that come on an off, running lights remain on and this means they pull more current. A weak ground may still allow those other functions to operate and reveal itself only when your load draws higher current, such as when the taillights are on. Check the main white ground wire on both the vehicle harness and the trailer harness. (Focus on the vehicle since the trailer...
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  • Length of Trailer Wiring Harnesses for 2003 Toyota Sequoia
    There are two wiring harnesses confirmed to fit the 2003 Toyota Sequoia. The Tekonsha # 20137 and the Hopkins # HM11143384. Both are designed and have been tested specifically for your vehicle if you have the connectors are the rear of the Sequoia which can be found slightly towards the driver's side. I've attached a picture of the connectors on the harnesses. The Tekonsha harness measures about 16 from the back of the 7-way connector to the end of the connectors that mate with the...
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  • Recommended 7-Way Trailer Connector And Brake Controller For 2005 Toyota Tundra
    For your 2005 Toyota Tundra, I recommend the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires, # ETBC7. This kit will use your existing 4 way and will allow you to connect the reverse wire, 12V power wire, and brake controller wire to make a 7-way and 4-way accessible connection. This kit includes the wire, the circuit breakers, and all the connections needed. I've attached a couple videos to help. The # 20137 plug and play is only available...
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  • Will Replacement Multi-Tow 7-Way for Toyota Vehicles Mount In an Accessible Location
    This part comes with a mounting bracket so you can mount it wherever you need to in order to have access to it. It will plug into factory connectors and not require any hard wiring.
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  • Recommended Replacement 4-Way and 7-Way Wiring for a 2003 Toyota Tundra Without a Tow Package
    The # 20137 would not be a fit for your 2003 Toyota Tundra, as it will only work on models with the factory tow package. In order to first replace the 4-Way plug, you will need to use a hardwire kit, like part # C59236. The # C59236 wiring kit is a universal application, so vehicle specific instructions are not available for your Tundra. You will need to use the included circuit tester to determine which wires behind your vehicle taillights are performing which function, and connect...
    view full answer...


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