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Troubleshooting Trailer Running Light Circuit Not Active on Truck But Tester Shows Voltage


I have a 2013 F150 EcoBoost and it has the tow package. The seven and 4 pin adapter in the back did did not come with the relay or the fuse installed. I put the relay in number 6 position and I dont really know where to put the fuse unless it is number 67 there is already a fuse there. I have left turn, right turn, and brake lights but no tail/running lights. I do have power to the taillight pin but when I plug the trailer in no running/tail lights come on. There are no issues with the trailor wiring as it works with other trucks. Any ideas ???


Expert Reply:

If you have power to the taillight pin of the 7-way on your truck but you can't get the circuit to activate with a connected trailer this commonly is caused by corrosion preventing the connection from being made or the pin being bent back which also prevents the connection from being made.

I also attached a help article on troubleshooting trailer wiring for you to check out as well.

expert reply by:
Jameson C

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