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Discussion Starter · #1 ·
When I plug in either 4 pin flat or 7 pin round the trailer running lights illuminate, but I don’t have blinkers or brakes. My truck lights work fine and I’ve tried 2 different trailers, one with brand new wiring. I’m thinking a fuse or relay problem? I check the fuses that correlate with trailer wiring and none of them are blown.
 

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Discussion Starter · #2 ·
Update. The trailer lights function correctly with my headlights off. I see that’s a common issue with the ground for the lights however my trailer lights are the magnetic type so the only ground is to the truck. Is that the issue?
 

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Should be a ground from the trailer to the truck, so it could be.
 
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