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Old 11-15-2008, 12:00 PM
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83 chevy pu hedlight/horn problem

I've got a 1983 chevy pu that I recently put new head gaskets in. The other night on the way home I noticed the headlights were flickering off and on with the bumps in the road. Eventually they went out and now I can't get them to come on. I've checked a bunch of grounds under the hood, but that's about where my knowledge ends.
I don't know if they are connected or not, but the horn doesn't work any more either.
Any help would be great. Thanks!

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Old 11-15-2008, 01:05 PM
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First thing to check is the fuses make sure they all are good.

Next check to see if the engine side of the fuse panel is tight there is a 3/8th or 10mm bolt that holds it all in there you might want to inspect to see if there is any melting going on.

Next to check is the Light switch .

You have to be a contortionist to get to it

Remove the A/C duct
reach around till you find the release button & push it in while pulling out the stem then with a big flat head remove the switch & see if the plug is melted.

these are notorious for getting burnt if there is a short there is a lire that will go to the main harness that will be melted together & form a short.



R
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Old 11-15-2008, 04:30 PM
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That switch in your picture looks pretty bad. I took mine out and tried a new one from the parts store. It didn't work either.

So far everything looks good. I don't see any melted wires or connections. I don't even see anything labeled 'horn' or 'headlamps' in the fuse panel.
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Old 11-15-2008, 05:52 PM
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Hmm
Lets see next check your fusible links.

You do have power in the fuse box?

There should be a power wire that goes into a single bolt junction block on the fire wall almost right in the center. that powers a lot of stuff.

Yea that was like that when I got the truck its very typical if running too much stuff off the factory lights {lots of trailer lights}

I thought I took more pix of the repair .

The Head lamps are not fused there should be a solid HOT in there.

Man I know I have the Schematics somewhere maybe it in my repair manuals.

I would start @ the Headlights & work my way back until I Found the problem.




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Old 11-15-2008, 07:57 PM
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Thanks for the schematics, that'll help a lot. It's cold and dark out now, so I'll see what I can find tomorrow. Thanks again for your help.
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Old 11-16-2008, 01:54 PM
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When you had the heads off did you reconnect the ground straps that bolt to the back of the head(s)


Chet
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Old 11-16-2008, 09:28 PM
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I almost forgot that one, but I got it at the last minute.

I don't know what I have going on here. I took the junction box that's held on by a single bolt off and I found one red wire that is hot (12v) and nothing else. There didn't appear to be any damage or melting. I put it back together and made sure they were nice and tight. Still no lights - or horn. I'm in over my head.
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Old 11-16-2008, 10:10 PM
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Yeah sure sounds like a bad ground or poor connection... could you have had to pull a harness connector apart or even have stressed it somehow?
There should be a factory ground connection from the lighting harness to the rad support somewhere. (a screw or bolt with a star washer) Perhaps try locating and cleaning and tightening it?

Most of those electrical "gremlins" are due to bad grounds. If all else fails ... try making another ground connection from the frame to the rad support ... as rad supports are often mounted on rubber. Use a die-grinder to scratch up the painted surfaces at both ends of this new connection so you KNOW it is reliable.

If that fixes it ... you know that the factory ground connection was to blame.
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Old 11-25-2008, 08:13 PM
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I took the battery out and when I put it back in, one headlight worked!

The horn also worked, it sounded sick, but it worked none the less.
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Old 11-25-2008, 09:14 PM
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Take a look arround the battery box, there are probably some rotted wires or a corroded connector.

Chet
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