The blinker, brake and tail lights don't work. It's just the rear drivers side tail light. All the other lights work fine. The bulbs are fine. There's no power getting to it for some reason. Any ideas out there.

 

Can you find the ground point for that harness? If you have a circuit tester you can verify if this is a problem by grounding the black lead then probing the plug with the red lead. If power comes across that way it's a bad ground. I doubt it would be a fuse as brake and blinkers will have their own power feeds.

 

Would I want to apply power to it by turning on the taillights or brake lights?

 

Yes.

 

thanks. I'll give it a try.

 

So I tested the light and I got power from the black wire on the light bulb plug on my multi meter. I think I followed your instructions correctly. Can I just splice into that one wire and turn it into two and ground the new wire. If not I'm going to have one hell of a time trying to trace that wire. It goes inside the rails of my truck bed.

 

Harness goes straight down to the bed-chassis interface connector where the bumper meets the frame rail on each side.

 

I'll check it out tomorrow and try to fix it. Thanx

 

out of shear curiosity, are you using LED taillights?

 

For right rear lamps,

black is ground
brown with red tracer is right turn signal and brake (or Dark Green with brown tracer)
black with yellow tracer is running/marker/parking lights
Violet with black tracer is reverse