79 Chevy C10, I was doing some work to wire up a 4-wire harness for pulling a trailer, and discovered that I have signal light issues (I haven’t wired up the harness yet so this is before that)
Basically, it began with no left turn signal at all in the front or the back. I replaced the flasher relay and now it works in the front. I still don’t have any brake light or signal light in the back. The light simply won’t come on, even when the front left flashes or the brake light is on on the other side.
The crazy thing is, if I pull out the lights then the turn signal/brake light lamps on both sides come on. What gives?
Can anybody help me figure out the wiring here or figure out why I’m having these issues? Thanks