I have the factory installed trailer wiring hooked up on my 98 blazer. But I lost the left turn signal, and there is no power to the yellow wire when the turn signal is on. I tried tracing the wires back, and can see them dissapear somewhere above the frame rail.

does anyone know where these wire hook up to on the other end?

what else should I check?

 

I had a newer ranger and it actually had its own fuses for each wire to the trailer lights.

There should be power before the split cause your tail lights and brake lights are on the same wires. So either the splitter is bad or the wire. I would just splice off the tail light turn signal wire and call it a day if you can't figure it out

 

the fuse block under the hood will have separate fuses for all the trailer wiring check here first. just keep in mind that a fuse blows for a reason maybe redo the ground on the trailer this tends to be a common reason.