1991 white gmc turn signal wiring diagrams????

94f450sd

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as the title states.i need the diagram that shows what number wire does what and where its supposed to go.i can get the lights to work all but the brake light on the drivers side of the trailer,but the turn signal works.now i cant get **** to work right.on top of it im trying to fix somebody elses hacked mess again as usual.i really wish people would just leave stuff the hell alone if they dont know what theyre doing!!!!-cuss-cuss-cuss-cuss-cuss
 

Freightrain

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i can get the lights to work all but the brake light on the drivers side of the trailer,but the turn signal works.


The trailer? How's the wiring harness on the trailer? Most big trucks have separate brake/turn signals on trailer, so if one side works but not the other I'd look at the trailer wiring.

Does the truck have all lights working properly(brake/turn signal)?
 

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