Troubleshooting Trailer Blinker that Stops Working when Brakes Applied
Question:
I have just installed the Tow ready custom fit wiring harness on my 2011 GMC Canyon which worked fine, I have also installed on my trailer the 7inch transit Tail Light stop/turn/tail LED lights which work great. All lights function as they should except when I turn my left turn signal on and step on the brake the turn signal stops on the trailer only. It only does this on the left, the right works as it should. I have cleaned up some loose wires and grounds but it still does it. Any help please. Thanks
asked by: Kelvin C
Expert Reply:
First thing you should do at this point is 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. Just like in the video I attached.
If the voltage checks out there but the trailer lights still don't function right then the problem is on the trailer wiring. That would mean that problem is either due to a ground issue or a short issue.
Make sure that the trailer side connector are clean and free of corrosion inside and out. The main connector grounds should be attached to clean and corrosion free bare metal surfaces. The light grounds should also be attached to clean and corrosion free bare metal surfaces. If there is anything between a light ground and the metal trailer frame or if the trailer has an aluminum frame, tilt bed, or folding tongue, any of these things can interrupt the ground. Running jumper wires from the light grounds to the main trailer connector ground can help.
If the problem is on the vehicle side then I would first recommend you double check how the harness is installed on your vehicle, make sure all of the connections are good and tight. You should check all towing related fuses and relays as well.
Products Referenced in This Question
T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Converter
- Custom Fit
- 4 Flat
- Tekonsha
more information >
Product Page this Question was Asked From
Hopkins Plug-In Simple Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- No Converter
- Custom Fit
- 4 Flat
- Hopkins
more information >
Featured Help Information
Instructions
Miscellaneous Media
Continue Researching
- Article: Troubleshooting 4 and 5-Way Wiring Installations
- Search Results: converter
- Shop: Hopkins Tail Light Converter - LED Compatible
- Shop: Pollak 7-Circuit-Breaker Junction Box
- Shop: Trailer Wiring Junction Box - 7 Color Coded Terminals - ABS
- Shop: Vehicle Tow Bar Brake System
- Q&A: How Do I Convert My Incandescent Trailer Lights to LED Lights
- Q&A: Trailer Brake Lights Work But Turn Signals Do Not Work
- Q&A: Changing the Bulb in the Wesbar Tail Light Capsule
- Q&A: Correcting Trailer Ground Problem Turn Signals Blink Once and Stop When Brake Is Pressed
- Q&A: Wiring Diagram for Trailer Breakaway Kit
- Q&A: Turn Signals on Trailer Work Opposite of Truck With Brake Applied
- Q&A: Installation and Troubleshooting Wesbar Replacement Lights and Right Turn Signal Not Functioning
- Video: Pollak Wiring PK52249 Review
- Shop: Replacement Light Bulb # 1157
- Shop: T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Shop: Trailer Wiring
- Search Results: diode kit
- Search Results: diode
- Search Results: 4 round to 7 blade adapter
- Search Results: hy power diodes
- Search Results: tow diodes
- Video: Review of Hopkins Wiring - 7-Way Blade to 7-Pole Round Wiring Adapters - 47595
- Video: Buyers Products Wiring 3375601101 Review
- Video: Buyers Products 7 Color Coded Terminal Trailer Wiring Junction Box Review
- Shop: Roadmaster Universal Stop Light Switch Kit
- Shop: Roadmaster Brake-Lite Relay Kit for Towed Vehicles
- Shop: Vehicle Tow Bar Wiring
- Video: Roadmaster Stop Light Switch Kit Installation - 2021 Jeep Wrangler Unlimited
- Video: Roadmaster Battery Charge Line Kit Installation - 2010 Jeep Wrangler
on Custom Fit Vehicle Wiring
