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Old 08-10-2009, 11:59 PM
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S10 lighting issues... going insane!

So we v8 swapped a 98 s10, heres my issue

I have no headlights, take the volt meter to the headlamp harness and both sides of the plug are getting 12 volts positive where one should be a ground. checked all fuses, swapped relays and stuff like that... and nothing.

No brake lights, well kinda. Turn the key on and the brake lights are on. push the peddle and they go out, but the third brake light comes on. On a side note, the head light harness loses power..

turn signals work, hazards work, interior lights work.

Another Question, Brand new summit gauges, all electrical. got them wired, they light up but all the needles go to the high side. whats that about?

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Old 08-11-2009, 09:47 AM
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Your ground for the lighting circuit is missing. Trace it back. Most likely you broke a wire or failed to re-connect something.
All the issues could be related to the same ground issue. If you can locate a diagram it should be east to trace and fix
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Old 08-11-2009, 01:03 PM
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i figured it had to be a ground issue, but i cannot find any missing wires. everything was disconnected at the bottom of the fuse panel. there are four plugs. one for the front lighting harness, one for the body harness including the BCM, one for the rear lighting including the fuel pump and sender, the last was for the engine manegment computer which we just unhoooked when we yanked the 2.2. the plugs are indexed so they can only be hooked up one way. im not sure if there was a ground in the engine harness that could affect it. im going to the junk yard to nab another plug to try that today. im still not sure why i would have 12 volts positive to both wires though.
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Old 08-11-2009, 01:05 PM
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Quote:
Originally Posted by Soule88
i figured it had to be a ground issue, but i cannot find any missing wires. everything was disconnected at the bottom of the fuse panel. there are four plugs. one for the front lighting harness, one for the body harness including the BCM, one for the rear lighting including the fuel pump and sender, the last was for the engine manegment computer which we just unhoooked when we yanked the 2.2. the plugs are indexed so they can only be hooked up one way. im not sure if there was a ground in the engine harness that could affect it. im going to the junk yard to nab another plug to try that today. im still not sure why i would have 12 volts positive to both wires though.
You are seeing 12 volts at both wires because teh bulb filiment is feeding it through most likely
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Old 08-11-2009, 10:52 PM
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no i was seeing 12 volts on both sides with out the bulb even in. Found my issue though. was one little black wire that had pulled out of the harness plug.
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