Trailer Lights
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Cross-Country
Joined: Apr 2023
Posts: 51
Likes: 1
Trailer Lights
Hey Guys,
I’m sure this has already been answered, but, I have a 2004 F-350, 6.0, a while ago, I hooked up to my horse trailer, I only had running lights, no brake or blinker, thinking I had a problem with the trailer, I rewired the whole thing with all new wiring and LED’s, put in a new 7pin connector on the truck, traced all the wiring on the truck from the connector to the block under the hood, tested everything with a light and ohms tester, can not find any issues anywhere other then no power, fuses are good, I also have a 99 with a 7.3, hook the trailer up to it and everything works, could I have a relay out in the under hood block? I don’t have much more hair to pull out
I’m sure this has already been answered, but, I have a 2004 F-350, 6.0, a while ago, I hooked up to my horse trailer, I only had running lights, no brake or blinker, thinking I had a problem with the trailer, I rewired the whole thing with all new wiring and LED’s, put in a new 7pin connector on the truck, traced all the wiring on the truck from the connector to the block under the hood, tested everything with a light and ohms tester, can not find any issues anywhere other then no power, fuses are good, I also have a 99 with a 7.3, hook the trailer up to it and everything works, could I have a relay out in the under hood block? I don’t have much more hair to pull out
Thread Starter
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Cross-Country
Joined: Apr 2023
Posts: 51
Likes: 1
I did that last nite, with a light, it’s hot and the fuse wasn’t blown, all fuses are good and they all have power, that’s when I started thinking it might be a relay in the block under the hood, wires are dead up to the block, with the exception of running lights, those work great.
Hotshot
Joined: Jan 2004
Posts: 19,760
Likes: 1,078
From: St Louis
I did that last nite, with a light, it’s hot and the fuse wasn’t blown,
wires are dead up to the block,
Do the two trailer turn/stop relays click, individually for turns, both for brakes, when either a turn signal is activated or the brake pedal or hazard switch is activated?
Thread Starter
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Cross-Country
Joined: Apr 2023
Posts: 51
Likes: 1
Problem solved
After a lot of tracing of wires I finally found the wire that controls brake lights and blinkers, it had been rubbing on the inner fender liner and was completely worn through, however it wasn’t visible until I took the fender liner out completely
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