Troubleshooting Running Lights Not Working on Trailer Towed with a 2014 Ford F-150

Published 12/19/2018

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Question:

when trailer is plugged in the left ,right blinkers work and brake lights work, but running lights will not. F-150 ford 2014 Manuel does not give any information Thanks

asked by: Donnie C

Expert Reply:

The easiest way to check and see if something is not working on your 2014 Ford F-150 connector is to use a circuit tester like part # PTW2991 or a multimeter like part # PTW1714 and test the pin for the running lights (see attached pictures). If you are getting power then the issue is on your trailer side but if you don't get power then you either have a bad fuse/relay or the OEM wiring is damaged. When I checked the online version of the owner's manual for a 2014 F-150 the only fuses I could find were #43 and #67 in your Power Distribution Box.

To check the wiring on your F-150 or your trailer simply trace it and look for any places where it is damaged or bent and replace as necessary. It is also helpful to check the actual vehicle and trailer connectors as well to ensure they don't have rust or corrosion. Attached is a helpful article that goes over trailer light troubleshooting for you to check out.

If you are still having issues just let me know and I can help you troubleshoot further.

expert reply by: Jon G