Troubleshooting Trailer Wiring

What Triggers "Check Trailer Wiring" DIC Message - GM-Trucks.com

I had the same problem after getting my 2020 Silverado. I swapped out the 7 way plug with a blade style plug after reading about the problem on ...

Trailer lights problem | Chevy and GMC Duramax Diesel Forum

Also check the trailer wiring for corrosion were the wires are spliced.The first thing you do is find out if you got juice to the brake wire ...

Trailer lights not working!?!? - Tacoma World

A simple check with a 12 volt test lamp to the center pin (orange wire) or the # 4 terminal (black wire) should tell you if the truck is OK.

2 Curt wire harnesses have gone bad on me

This trailer tows fine with two other trucks with zero issues over hours of driving. CURT techs just say the black box is sensitive to any ...

Running lights not working on trailer light connector

The brake and turn signal lights work great with the truck, just no running lights. A trusty multimeter indicated no voltage on the running light lead.

Trailer wiring not working | GMC Yukon Forum | Cadillac Escalade

Plugged a tester into and the 12v works but nothing else. Brake, turn, reverse all won't work. Any ideas ? I check the fuses under the hood and all were fine.

Trailer wiring problem? - iRV2 Forums

If you aren't blowing fuses, I bet you have a ground problem. Try getting a piece of wire, at least 12 gauge and ground it very well from the trailer frame to ...

Major problem with the trailer package wiring!! - GMC Acadia Forum

Perform this procedure only if the customer will be using the vehicle to tow. 1. Disconnect the X7 connector from the Body Control Module (BCM).

7 pin wire harness problem - Forest River Forums

Your problem could be where the cord joins the wiring in your trailer. Usually this occurs in a plain old residential junction box located ...

Trailer Wiring Harness - The Malibu Crew

... problems from not unhooking the wiring harness . ... I've not unhooked a boat trailer in many many years, never had a problem.

OEM Trailer Wiring Harness not working - Kia Forum

If it is a KIA OEM harness, there is another fuse. You have to remove the left tail lamp housing. It should be a plug in type hanging down in ...

Trailer wiring problem - advice needed [Archive] - Walleye Central

Hook up the wires, with the original, or replaced lamp assembly and you will now know that the trailer is 100% good. Now, hook to your tow ...

Trailer connector output issues/errors - Mercedes-Benz Metris Forum

I have been having issues with the output of the trailer wiring connector on my 2016 Metris. In general it thinks that some of the trailer lights are out/bad ...

Triton trailer light problem. Not typical. Please help. - BBC Boards

It is a lot easier to using a circuit tester which clips to a ground or on the trailer and then touch the hot wire/brown. You may need to test the ground at the ...

Trailer wiring problem - Nissan Forum

I have a problem with my trailer wiring, the turn signals and the brake lights work OK, but the running lights or parking lights are not coming on.

Trailer Wiring Issue (No Brake Lights) - Subaru Outback Forums

Most trailer light issues are grounding related. When the 7-pin plug was installed, they had to add a new ground wire. It will be screwed into the car frame.

Trailer hitch wiring harness problems - Colorado Fans

Turns out the trailer hitch wiring harness started on fire. Has anyone ever heard of this, or know of a recall? I'm certainly going to contact GMC and let them ...

how to debug oem towing wiring harness - trailer lights not working

Looking for a step by step approach on how to debug the oem towing wiring harness. This is new to me. I searched but could not find anything that has an actual ...

Trailer wiring problem - TDIClub Forums

A low draw circuit (LEDs) works normally but a relatively high current draw (incandescent lamps) does not. Could be impedance in either supply or ground ...

Troubleshooting trailer running light problem - Toyota 4Runner Forum

The running lights work normally when trailer's connected to another vehicle. Nothing seems to be out of order with the runner connector itself- ...