Wiring frustration, lights.

[bouda]

Alright I don't know where to start so I'll just spill it. '99 S10 PU 2WD RC SB 2.2 5SPD.

All problems seem to be rear passenger side.

Lights on, all good.

Lights on + reverse = No passenger reverse light, no passenger license plate light.

Lights off + reverse = Reverse light on license plate light on.

Lights off + drivers side blinker = All good.

Lights off + passenger blinker = Blinker blinks with license plate light.

Lights on + drivers side blinker = all good.

Lights on + passenger side blinker = Blinker blinks with license plate light / both blink fast.


I removed rear harness from truck and stripped of all the loom. I inspected the wiring, found nothing. There is only one ground for the entire rear harness, it's good.

I did find something on on the drivers side blinker socket. It looked like it got hot at one point. Someone spliced in some wires there that I assume would run a third brake light on a topper. I removed the wires. That socket always worked and still does.

Re-wrapped the harness and reinstalled it. Nothing has changed.

Is the problem with the blinker switch or what? I'm out of ideas.

P.S. Does anyone know what those odd looking connectors on the rear harness are for? I can't imagine what they'd ever be used for.


Thanks for any help,
-Buddha

[bouda]

My head hurts.

[darndot]

License plate lights shouldn't blink, but you know that already.

Remember voltage is trying to find ground. Looks like it is doing that going thru the license plate light.

What does that mean? I would think that rules out the blinker switch, but I not sure past that point.

[bouda]

Thanks for the reply.

I wonder what would happen if I pulled the license plate lightbulb...

[Triple-X08]

if there is any form of corrosion in the sockets then it will cause problems, make sure there isnt any hidden scotch locks or anything of that nature. it could be a fun task trying to find your problem. make sure your ground is good and tight, and clean.

[bouda]

I re-did the ground a couple months ago when my fuel pump wouldn't run. It uses same ground. "scotch locks", yer gonna have to spell that one out for me. I noticed a couple sockets looked like they may have gottn just a little hot. I was thinking about going to my local pic a part and snatchen some.

Thanks for the help,
buddha.

[bouda]

I fixed it.

I went to the library and looked up the wiring scematic. I stared at the computer screen for a good thirty minutes. Computer said two grounds, I was sure it was wrong.

Seems when the people who had the truck before me replaced the box they messed up two grounds. One for the fuel pump/drivers side of the rear wiring harness, which I was painfully aware of. And the ground for the passenger side of the wire harness. I found a neatly snipped wire right at a connector that I had overlooked earlier.

I feel better now, thanks for the help.

[IROCNROL1]

I was going to say that when electrical things are acting weirdly it most likely is a ground problem.

Better late than never, or not.

[LAMRONH]

Originally Posted by bouda

I fixed it.

I went to the library and looked up the wiring scematic. I stared at the computer screen for a good thirty minutes. Computer said two grounds, I was sure it was wrong.

Seems when the people who had the truck before me replaced the box they messed up two grounds. One for the fuel pump/drivers side of the rear wiring harness, which I was painfully aware of. And the ground for the passenger side of the wire harness. I found a neatly snipped wire right at a connector that I had overlooked earlier.

I feel better now, thanks for the help.

Thankfully, when they did their hack work, they did it neatly!

[darndot]

I would have never thought to go to the library. I would have sold the truck.

[slls]

Originally Posted by bouda

I fixed it.

I went to the library and looked up the wiring scematic. I stared at the computer screen for a good thirty minutes. Computer said two grounds, I was sure it was wrong.

Seems when the people who had the truck before me replaced the box they messed up two grounds. One for the fuel pump/drivers side of the rear wiring harness, which I was painfully aware of. And the ground for the passenger side of the wire harness. I found a neatly snipped wire right at a connector that I had overlooked earlier.

I feel better now, thanks for the help.

Well where is the passenger side ground, would be nice to know.

[bouda]

I found the wire on the harness. I don't have a clue where it was supposed to be grounded from the factory. I couldn't find anything. I just ran it back to the drivers side frame rail where my other ground is. The wiring schematic said "passenger side frame rail".

[scooter10572]

Originally Posted by bouda

I found the wire on the harness. I don't have a clue where it was supposed to be grounded from the factory. I couldn't find anything. I just ran it back to the drivers side frame rail where my other ground is. The wiring schematic said "passenger side frame rail".

s 10 trucks usually have a ground on both sides of the frame near the end with possibly a splice pack thats usually on the pass. side rail.if you have a ground problem electricity will search for one and cause strange things to happen.clean the frame rail on both side and aplly dielectric grease to the grounds and clean and retighten them