Help Me Please Before I set my K5 on Fire!

[cliles]

I seriously need some advice. I am trying to get my 1990 k5 inspected, but for some reason when the left turn signal is activated, all the turn indicators/tail lights flash. When I turn the head lights on (hi beam or low beam) the left side turn indicators do not work (no blinking). All of the other lights appear to operate fine (whether the headlights are on or not).

I have checked the wiring (under the hood and dash) for anything that looked supsicious (PO special wiring, damaged wires/grounds), but have found nothing obvious.

I got my wiring diagram out, and trired to follow everything in the light blue wire circuit (left turn signal), and found nothing out of kelter. I have tried changing bulbs from right side to left side, and the right side still works and left side does (bulbs are not the issue (all bulbs light and flash, so I do not think the bulbs are the problem).

I am not an electrical engineer, but I am also not incompetent. I have spent a couple of hours on this, and have simply hit a brick wall.

If you have any advice, I would appreciate it.

Thanks,

Chris

 

[bradshawtech]

Trailer plug connection? Maybe if you have one it might be corroded or full of water.

 

[blazinzuk]

tried replacing the flashers on the fuse block they can cause some weird stuff

 

[folkenheath]

My guess is the harness that goes to the tail lights has been damaged and the brake light and tail light wire are contacting each other. Which could be in the harness or in a trailer wiring adaptor like they said.

I had a similar problem once, right after my muffler blew out and it melted the wires together in one spot. The timing of it happening with the muffler blow out kind of led me to the problem right away.

 

[olanchamedic]

Check all your grounds. Tail lights and headlights have a ground near the light housings. It sounds like something is coroded or loose. Start at one end and work your way to the other, checking all plugs, connections, grounds, etc. Youll find the problem.

 

[63chevyll]

could be a bad socket?

 

[cegusman]

Check you bulbs too.

 

[cliles]

Check you bulbs too.

Sorry, I thought I responded to this thread, must have been on my build page.

Yes the PO had a single filament bulb in a dual filament socket. I found that out after tearing through a bunch of other crap. I never thought to check that bulb because it was not one that I had replaced, and it was working, lesson learned.

Thanks,

Chris