Only the rear marker lights are not working on the trailer. I hooked up to another trailer and the same issue, therefore im guessing its my truck. I changed out the relay and fuse and still having the issue. I cant expand the pins on the trailer to see if that helps because they are solid pins. Any help would be appreciated, thanks
All my lights on the truck work, all other lights on the trailer work.
only Marker rear lights not working
Discussion in 'Ask An Owner Operator' started by Transportacion R&R, Jun 4, 2020.
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You might have a bad pigtail or 7 way socket on the truck. I would try and swap the electrical cord with someone. If that's not it, I'm guessing it's the socket on the truck.
chevyryder86 and ChevyCam Thank this. -
The female socket on back of the truck picks up alot of salt and dirt over winter time, truck parts stores sell a pigtail cleaner tool to clean pins you can use on truck and trailer plug in socket?
feldsforever Thanks this. -
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Trucker61016 Thanks this.
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What kind of truck? Some have an extra switch/plug for upper marker lights it might be a different circuit then marker
Crude Truckin' Thanks this. -
I'm guessing it's the socket on the truck. You can try seeing if you power to the pin where the black cable goes into. If you look a 7 way diagram for trucks/trailers you will see what I am talking about.
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Marker or tail lights not working? They're 2 different circuits. IIRC brown wire is tail lights, black wire is clearance lights.
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Trucker61016 Thanks this.
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