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

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

Item # HM48503
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Hopkins Trailer Connectors - HM48503
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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. Lowest Prices for the best 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 800-298-1624 for expert service.
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  • Reviews (39)
  • Q & A (17)
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Hopkins Wiring - HM48503

  • Trailer Connectors
  • Trailer End Connector
  • 7 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 Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (39 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.

- HM48503
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.


Comments
still working perfectly
Dan E - 08/17/2020


- HM48503
by:

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



- HM48503
by:

Quick shipping and product was as advertised. Thank you much



- HM48503
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!


Comments
After a year, the connector is still in great shape and working great!
Chad - 08/15/2019



- HM48503
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.



- HM48503
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.



- HM48503
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.



- HM48503
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.



- HM48503
by:

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


Comments
The connector is great, I bought one for my dump trailer as well.
Gary G - 08/05/2018



- HM48503
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


Comments
Outstanding
Jhayden - 06/23/2017



- HM48503
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.



- HM48503
by:

I needed a new plug anyways and figured this is like killing two birds with one stone. Great turn around from ordering to delivery. It works great.



- HM48503
by:

Excellent product, works great and perfect for my daughter's horse trailer so she can quickly identify where her problem may be!



- HM48503
by:

Simple and inexpensive way to confirm you have power going to the contacts... so you know problems are in your wiring not car's LOL Simple & effective.



- HM48503
by:

Ordef was timely delivered and was exactly as represented. The right product that I needed. Technical support for E-Trailer was very helpful. Will buy all of my towing needs from this company.



- HM48503
by:

The products are great. Too quality and well worth the money. I would recommend any of these products. Whoever packed the box did a poor job but not a reflection on the quality of the products themselves.



- HM48503
by:

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



- HM48503
by:

Great product and I really appreciate reviews and instructions!



- HM48503
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.



- HM48503
by:

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



- HM48503
by:

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



- HM48503
by:

The products ordered were received on time and were the items I ordered, thank-you



- HM48503
by:

Looks to be of good quality. Have not had the chance to try out yet. Will be a little longer than average plug. Fast delivery.



- HM48503
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.



- HM48503
by:

Exactly what I was looking for. Great quality and quick shipping.


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Ask the Experts about this Hopkins Wiring

  • 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...
    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
  • 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
  • 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...
  • 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 vehicleside 7-way connector with a circuit tester like # 40376 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...
    view full answer...
    Image 1 for
  • 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...
  • 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 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...
  • Recommendation on a Trailer Light Tester
    I found a solution for you. The Tow Ready 7-Way Trailer Vehicle Tester, # TR20117, 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...
  • 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 # TR20117 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...
  • 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...
  • 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 # TR20117 which plugs into a 7-way socket and will let you know which circuits are active. See attached review video.
    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...
  • 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 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...

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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:
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Employee Alexander C
Updated by:
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