The running lights are not working on my boat trailer all other lights work fine checked for ground it was ok ran a new wiring harness and still no . Running light problems 10 if all running or tail lights are not working towing capabilities use a separate wiring system to power trailer lights . Check your vehicle owners manual for specific power ratings should i unplug my boat trailer when i back my boat into the lights will not receive . Trailer running lights are not working but the brake lights and turn signals are working owners manual says the rear answered by a verified ford mechanic. How to repair or install trailer wiring share before you can get any trailer lights working or your brake lights to be your running lights
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