bing tracking image
  1. Trailer Wiring
  2. Hopkins
  3. Trailer Connectors
  4. Trailer End Connector
  5. 7 Round - Blade
  6. Plug Only
Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End
Hopkins

Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End

Part Number: HM48503
In Stock
$28.98
Trailer Wiring
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Need help with installation?
Locate installers near me
Built-in LED lights on this 7-blade connector let you know if power is being received from the tow vehicle. Separate lights illuminate to verify power to each function on your trailer for easy troubleshooting. Strong ABS plastic construction. Great Prices for the best trailer wiring from Hopkins. Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End part number HM48503 can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (55)
  • Q & A (0)
  • Photos

Hopkins Trailer Wiring - HM48503

  • Trailer Connectors
  • Trailer End Connector
  • 7 Round - Blade
  • Plug Only
  • Hopkins

Built-in LED lights on this 7-blade connector let you know if power is being received from the tow vehicle. Separate lights illuminate to verify power to each function on your trailer for easy troubleshooting. Strong ABS plastic construction.


Features:

  • 7-Way, RV-style, trailer-end connector plugs into the 7-way on your vehicle
  • Built-in, red LED lights offer easy troubleshooting
    • Illuminate to verify that the connector is receiving power from the tow vehicle
    • Labeled for each function on your trailer
  • Easy-to-grip tabs allow for simple plug in and disconnect
  • Strong and durable ABS plastic construction
  • Corrosion-resistant terminals withstand the elements
    • Terminal grease is included


Specs:

  • Wiring configuration:
    • Green: right turn signal (RT)
    • Yellow: left turn signal (LT)
    • White: ground
    • Brown: tail light and side marker lights (TM)
    • Blue: electric brake (EB)
    • Red: auxiliary (AX)
    • Purple: backup/reverse lights (BU)
  • 90-Day limited warranty


Reduce the frustration associated with troubleshooting trailer wiring problems with this lighted 7-way connector. It has built-in LED lights that help you determine quickly and easily if the issue is with your tow vehicle or your trailer. Just plug the connector into the 7-way on your vehicle. No need for separate testing tools. Then activate each function on your vehicle and a red light will come on if power for that function is being received by the connector. If there is power going into the connector for all of the functions, then you know that the problem is on the trailer end and you will need to check your trailer's wiring. Each function except for ground is represented by a separate light and the functions are labeled for easy identification.



48503 Hopkins Plastic Trailer Connector with LED Test Lights - RV Style - 7-Pole




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End - HM48503

Average Customer Rating:  4.8 out of 5 stars   (55 Customer Reviews)

Built-in LED lights on this 7-blade connector let you know if power is being received from the tow vehicle. Separate lights illuminate to verify power to each function on your trailer for easy troubleshooting. Strong ABS plastic construction.

by:

Easy to wire and very convenient indicator lights. Only thing to be aware of is the power light will stay lit if your trailer has a battery (e.g. a camper) and so it will put a small drain on it. Not really consequential if you're properly taking care of your battery anyway (disconnect or trickle charge when not in use).



by:

This connecter was very easy to install, and the LED display is a great addition.



by:

Big help in trouble shooting, as well as rugged!



by:

Very good product and great customer service from etrailer! The plug was easy to install and looks well made however keep in mind (as stated by another reviewer) if you are installing this on a trailer that has a battery such as a camper, the aux light will stay on since it is receiving power from the camper battery. You could install a diode, cut the wire going to the light, or leave it since it doesn't draw much power. Be sure to not over tighten the screws holding the wires either because they can strip. The plug took a little extra time to ship so etrailer called and emailed me to let me know! That is terrific customer service in my book and that is why I will continue to be a very happy customer with them! Thank you!

Chad

8/15/2019

After a year, the connector is still in great shape and working great!



by:

Love how sturdy the product is, great q uality!



by:

Fast...easy...works perfectly...no prob lems!!!



by:

I will be using the unit only to test our vehicles for proper operation at the vehicle trailer connector. for this purpose it has performed perfectly. I have no doubt that it will perform as well when used as designed, in an application as an actual connector for an individual trailer.

Michael

10/7/2022

I have used the test feature of the connector numerous times. It has allerted me to a failure within the trucks 7 way connector which has been fixed. It has also been instrumental in allowing me to determine that the trucks system is working properly while trying to find a fault in the trailer right turn signal. I have found that the 5 pin input plug is extremely tight when attempting to connect my trailers 5 pin into it, actually even more difficult to extract the 5 pin connector from it. I am still using it as a testtroubleshoot tool only.



by:

Excellent product high quality. I like being able to troubleshoot connection from indicator on plug. If you hook to a different tow vehicle you know right away it if is wired correctly.

Dan S.

8/17/2020

still working perfectly



by:

I bought this because my new car-hauler trailer's "7"pin connector only has 6 pins. Since my trailer did not have back-up lights the trailer company thought they could save a few pennies and install a slightly cheaper connector. Since it's the center pin that carries the juice for back-up lights, that was the one that was missing.
This connector solved that problem. After installing two fairly bright flood lights on the back of my long car-hauler trailer I ran a hot wire up to the front of the trailer, chopped off the "6"pin connector and installed this connector with all seven wires. What a difference! I can now back this long trailer into my 80' deep, dark building without running into stuff. ha I really like the LED test lights built into this plug. You instantly if any non-lit lights are the fault of the tow vehicle or the trailer wiring.



by:

Exactly what I wanted, to be able to confirm the connector is receiving power from the vehicle which is great for troubleshooting. My old connector often wouldn't make a connection, easy to see if this one is connected or not. Easy to connect, and you can orient the LED's and any of 4 different directions. My cable was slightly to big to fit through the connector, I had to remove some of the thicker outer insulation and replaced it with heat shrink tubing. The wire connections work well but could be a bit easier, the screw is right in the middle of the connector which means the wire has to go to one side or the other of the connector.

One other oddity, to be expected when you think about it, is the LED for Power to the trailer (charging the trailer battery when connected) is always on, even when disconnected, since it is still connected to the trailer battery. I may consider installing a diode on the trailer side to prevent this.

Just installed it but so far very pleased with it.



by:

Exactly what i thought i ordered easy to wire an install by instructions provided delivery was faster than expected looking forward to doing more busines with etrailer again great product

Jhayden

6/23/2017

Outstanding



by:

It does drain power over a long period of sitting.



by:

This review is based upon this item becoming defective after complete and successful initial installation. After a few weeks since I installed this product on one of my utility trailers the front portion of the clam shell hosing simply fell apart. I contacted Hopkins to ask IF their product’s plastic in any way reacted negatively with di-electric grease. I was informed by Hopkins tech support it did not, in any way. After speaking with eTrailer’s tech support I ordered and they quickly mailed me a replacement of the same item. The replacement is now installed on the same utility trailer, using the same di-electric grease I used the first time. As I told Hopkins, IF the replacement falls apart in the same place, in a similar manner, they do in fact have a serious problem on their hands! I will mail the defective Hopkins product back to eTrailer and they will issue me a refund. I’m hoping eTrailer gets the defective 7 blade connector back to Hopkins for their review!



by:

I recently purchased a Hopkins 7 Blade RV style connector with LED test light display. The quality of the product is 4 stars, but the ability to see, or read what the LED indicator lights are indicating are very difficult. It’s black raised letters on a black background of the connector housing. Without already knowing what lights location is indicating, there’s no way you know what your viewing! So, the LED indicator lights are maybe 2 stars, maybe!



by:

Finally a trailer plug that lets you know the wiring is good to this point. Easy install and seems to be very durable. Great price. I always go with Hopkins plugs as thier connections are not brass and do not corrode easily like many other brand. But one; you'll like it.



by:

Very happy with my choice of this brake controller. Full of features that make it worth the price. I especially like the ability to store 3 different trailer settings. This makes it easy to use when you tow several different trailers without having to manually change the brake settings.



by:

LEDs are helpful, knowing that the electrical connection is good at that point.

Heath

6/29/2022

Well, weather not aging it much. Reliable even a year later.



by:

Connector was as good as its description. One page instruction sheet was clear and the 2 review videos were very helpful. It confirmed good power feed to the trailer when I was troubleshooting a light malfunction that turned out to be a faulty ground at the light.



by:

Very helpful with order process. Product appears to be top quality



by:

Great product. Watched video a couple times to understand color code wiring. Video was well done and very helpful.

Gary G.

8/5/2018

The connector is great, I bought one for my dump trailer as well.



by:

Only tested the LED lights so far. Haven't wired to the trailer yet. That's why only 4 stars. I'll send further info after I wire it up. So far, so good.



by:

Color coding didn't match the trailer and it is difficult to connect trailer wiring to terminals



by:

I use it for drag on trailer connectors on vehicles at work. Makes for easy quick test.



by:

This connector was superior to the factory installed one and was easy to install.



by:

Very well built, and I really like the power indicator light to tell me if I have it all the way into the socket.


25
55
Show More Reviews

See what our Experts say about this Hopkins Trailer Wiring

  • Can Hopkins 7-Way Connector Be Installed on Yakima EasyRider Trailer
    Yes, you can install the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 in place of the current 4-Way on your Yakima EasyRider # Y08129.
    view full answer...
    Image 1 for
  • How Does the Hopkins Trailer Connector Tester Display Connection Problems
    The Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 does not light when there is an issue. The tester will display lights when the feature you are testing is sending a signal to the trailer as it should. I've attached a video that demonstrates how the connector is used to test the different features.
    view full answer...
  • Can Hopkins 7-Way RV Style Trailer Connector and Tester # HM48503 be Used as Just a Tester
    Technically, yes, but Hopkins 7-Way RV Style Trailer Connector and Tester # HM48503 is meant to work as a trailer connector and tester. If you only need a tester to check a vehicle side connector then # C73NR would be the way to go. Since # HM48503 is open at the back I do not recommend using it as just a tester since moisture and other crud could get inside and cause it not to work properly.
    view full answer...
  • Can Wire Colors Be Trusted on 7-Way Trailer Connector Tester
    Hi Hollie; in general you cannot trust wire colors on trailers. There are some universal colors for different functions but there are too many instances where the colors don't match. Trailer manufacturers have a bad habit of using whatever is on hand so if they ran out of green wire that day (or some other color) they will proceed with whatever else is handy. It is for this reason that you always want to match wires by function instead of color. For example, the Hopkins 7-Way RV Style...
    view full answer...
  • 7-Way Wiring Function Locations To Correspond With Hopkins 7-Way Connector With LED Test Lights
    I have attached a trailer wiring diagram to assist and have also attached a couple photos to help with location and function. It sounds like you don't have the traditional wiring colors and I'm confused as to why you have two left turn stop functions and no reverse function. The Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End # HM48503 will have functions that correspond with the picture attached.
    view full answer...
    Image 1 for Image 2 for
  • Troubleshooting No Trailer Lights Working and Hopkins Tester Showing Multiple Functions Active
    The LED lights that are appearing on the Hopkins 7-Way # HM48503 are at least letting you know that power is reaching the 7-Way on your truck. The strange part as you mentioned is that it is essentially indicating that all lighting functions are being powered with any single function activated on the Tacoma. This along with the fact that none of the lights on the trailer are working means that your best option at this point is going to be to first manually test the 7-Way on the truck...
    view full answer...
  • Troubleshooting Hopkins 7-way Connector # HM48503 Having All Test Lights On But No Trailer Lights
    That is definetly unusual for all of the lights on the Hopkins 7-Way # HM48503 to be on at the same time, as that would mean that power is getting sent to all of the pins on your vehicles 7-way connector at the same time. Since there are no lights working on the trailer, I recommend checking the vehicle side 7-way connector with a circuit tester like # PTW2993 while a friend goes turns on the turn signals and applies the brakes and running lights one at a time. If you find that all of...
    view full answer...
    Image 1 for
  • Will Trailer Battery Cause 12 Volt Accessory Circuit LED of Hopkins Connector # HM48503 To Light Up
    Your trailer battery is the reason the 12 volt accessory circuit on the 7-way part # HM48503 is lighting up all the time. It's voltage is backfeeding to the connector and lighting the LED. This LED draws such a low amount it would take a very long time to have any real impact on the battery life. Since inactivity naturally drains batteries the battery would have already drained from inactivity before the light would drain it due to it's very low amperage draw.
    view full answer...
  • Does the HM48503 Hopkins 7-way Trailer Connector Need to Be Grounded to Towed Vehicle or Trailer
    I think I understand what you're asking. On the towed vehicle side of the connection, you should indeed have the # HM48503 connector you're using grounded to the vehicle's frame. I've provided a wiring diagram showing how the connection should be wired.
    view full answer...
    Image 1 for
  • 7-Way to 6-Pole Trailer Connector Adapter for Horse Trailers
    Most horse trailers have a 6-pole trailer connector. In order to attach the 6-pole trailer connector to your vehicle then you will want to use the Hopkins Heavy-Duty, Coiled Trailer Connector Adapter part # HM47083 if the center pin on your vehicle connector is for 12v power or part # HM47085 if the center pin on your vehicle connector is for the brake circuit. You will need a 7-way connector on your vehicle in order to activate the trailer brakes on your horse trailer. If you do not...
    view full answer...
  • Trailer Connector That Lights Up for use With 2019 Chevy Silverado 3500
    We do have an option for a 7-way trailer end connector that has lights but plugging in the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 upside down would not allow you to see the LED function as it would face the ground. Instead I recommend checking out the Hopkins 7-Way RV Style Trailer Connector with Nite-Glow # HM48502 because it will illuminate when plugged in. I have added a link to a video review of this connector for you to check out which shows how the...
    view full answer...
  • LED Circuit Tester For Vehicle End
    I have the perfect circuit tester for you! TheHopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 will test the following functions listed below.: Green: right turn signal (RT) Yellow: left turn signal (LT) White: ground Brown: tail light and side marker lights (TM) Blue: electric brake (EB) Red: auxiliary (AX) Purple: backup/reverse lights (BU) I attached a review video link below.
    view full answer...
  • Wire Gauge Of EZ Connector Magnetic 14-Pin Trailer Connector 319-S14-05-6
    I called our representative at EZ Connector and the EZ Connector Magnetic 14-Pin Trailer Connector part # 319-S14-05-6 has 14 gauge wire from the back of the connector. We do recommend a larger gauge wire for the trailer brake wire, 12V wire and reverse wire. I recommend using a Hopkins Universal 7-way plug part # 37185. This unit has 16 gauge wires for the Green, Yellow, and Brown wires and then 12 gauge wires for the Blue, White, Black, and Purple wires. Then you can the Hopkins 7-Way...
    view full answer...
  • Connection Indicators on Hopkins # HM48503 7-Way Connector
    Yes, if you have correctly attached the wires to your Hopkins # HM48503 7-way trailer connector with test lights, then each of the LED indicators will light as the function is used. If the tester light does not light up, then the corresponding light or function on the trailer will not work either. I have attached a video that demonstrates how the wires are connected inside the unit, and shows how the lights come one with each feature. If you would prefer a stand-alone tester you might...
    view full answer...
  • Will Hopkins 7-Way with Tester Part # HM48503 Work with 5th Wheel Camper
    Yes, the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights # HM48503 that you referenced would be the exact style of 7-way connector you would have on your fifth wheel camper so it would work well for you.
    view full answer...
  • How Many Lights Does Hopkins 7-Way RV Style Trailer Connector with LED Test Lights Have
    I'm a little confused by what you are asking because the Hopkins 7-Way RV Style Trailer Connector with LED Test Lights # HM48503 has six lights, though you wanted to know what was up with all three lights flashing. The lights on this tester indicate that power is getting through to each function. So if you only have three lights on the tester you will need to troubleshoot those specific functions, which will be on the vehicle end. I have added a link to a video review for you to check...
    view full answer...
  • Recommend Trailer Wiring Connectors To Test Functions Of 7-Way
    It sounds like you are looking for the LED testers integrated into your wiring. If you want the trailer side 7-way with LED, I recommend the Hopkins 7-Way RV Style Trailer Connector w/ LED Test Lights - Trailer End # HM48503. This will let you know if power is being received from the tow vehicle for each function to make testing and troubleshooting easy. This is already integrated in the Hopkins 7-Way RV Style Connector w/ Molded Cable and LED Test Lights - Trailer End - 8' Long # HM20087....
    view full answer...
  • 7-Way Trailer Wiring Tester Recommendation
    If you were looking for a 7-way tester that's a standalone tester and does not need to wire to a trailer you'd want the 7-Way tester part # C73NR which plugs into a 7-way socket and will let you know which circuits are active. See attached review video.
    view full answer...
  • Three Flashing Lights on Hopkins 7-Way RV Style Trailer Connector HM48503
    In regards to the Hopkins 7-Way RV Style Trailer Connector part # HM48503, the left turn "LT" and right turn "RT" signals are the only ones that should be flashing while activated. If you have other circuits flashing that means there is a short between circuits. I first recommend opening up the connector and seeing if you find any corrosion. If not, the issue could be on the vehicle so take a circuit tester and test the pins inside the trailer connector. If not, the issue is on the trailer...
    view full answer...
    Image 1 for Image 2 for
  • Recommendation on a Trailer Light Tester
    I found a solution for you. The 7-Way Trailer Vehicle Tester, # C73NR, will allow you to test the lighting functions on your vehicle's 7-way trailer connector. The plug connects and used LED lights that will display if you have a properly functioning 7-way or if there is an issue with the vehicles signal output at the connector. Also, if you are needing to test a 4-way flat connecter, I recommend the Curt LED 4-Way Tester, # I26.
    view full answer...
  • Trailer Connector On Weekend Warrior Wont Plug Into 2005 Ford Expedition
    If you can send me some photos of the trailer connector on your 2005 Weekend Warrior then I may have some better advice for you but I don't have any information on what trailer connector you have currently installed on your trailer. According to my research, it should be a standard blade style 7-way so if this is not what you have then odds are it was replaced with something different at one point in time. If that is the case then I recommend you just replace the trailer connector on the...
    view full answer...
  • Troubleshooting Reverse Lamps Installed on Dump Trailer Pulled by 2000 Ford F-350
    The first thing I'd check is the center pin on the 7-way connector on your truck to make sure it's active and powers up when the transmission is placed in reverse. If it's not, you might have a missing or blown fuse. One fuse is located in the panel under the steering column. Check the 10A fuse in location 28, and install or replace as needed. The other fuse and relay is located in the distribution box in the engine compartment which is located near the brake master cylinder that sits...
    view full answer...
  • Troubleshooting Only One Light Showing On Hopkins 7-Way RV Style Trailer Connector
    Based on the LED position you described on the # HM48503 it sounds like you're facing the trailer and the 12V power light is lit up. If you are facing the rear of your vehicle that would be the running lights. I would go ahead and verify this using a circuit tester like the # PTW2993. Check all of the pins on your 7-way to make sure it is the 7-way on your vehicle and not the test lights on the connector malfunctioning. Assuming you don't have power when you test your turn signals and...
    view full answer...

Do you have a question about this Trailer Wiring?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Lindsey S
Edited by:
Lindsey S
Employee Chelsea B
Written by:
Chelsea B
Employee Alexander C
Updated by:
Alexander C

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-800-940-8924