Troubleshooting Trailer Wiring Where Running Lights Only Work
Question:
I purchased this kit along with the hitch several years ago, I installed the hitch as at the time we only needed to hook up a bike rack. The harness sat in the package in the drawer until last weekend. I installed it as directed. I have adequate power and ground. The signals, hazards and brakes do not work. The running lights turn on when the headlights are on but nothing more. Is there something else to check or do I simply have a faulty part?
asked by: Robert G
Expert Reply:
First thing you should do at this point is test the 4-way of the wiring harness with a circuit tester part # PTW2992 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
Product Page this Question was Asked From
Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector
- Custom Fit Vehicle Wiring
- Trailer Hitch Wiring
- Powered Converter
- Custom Fit
- 4 Flat
- CURT
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