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Old 10-29-2005, 04:05 PM
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'91 S10

I'm tryin to help an older gentleman who approached me at work the other day. He has a 1991 S-10 with a 4.3L (carbed), and we're tryin to figure out how to get the interior lights to work. All the lights work except the auxiliary lights on the bottom of the rearview mirror. The wires were cut and i tried re-connecting the wires with and without the stock connector but they wouldn't work. I traced the circuit as far as I could to figure out if maybe there was a dead fuse or if it had a seperate circuit that had no fuse in the block. I had no luck tracing it that far though. Does anyone know what circuit the lights would be on? If you know what years the wiring diagrams are similar or need more info post 'em for me or leave 'em in my e-mail at rekrap07@shaw.ca

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Old 10-29-2005, 06:51 PM
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Doc here,

Here you go...



Looks like a lighting control module may be involved..check the fuse for it and ALL other fuses as it may share a circuit unmarked with another device..check with a meter..visual doesn't get it.

Doc
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Old 10-29-2005, 06:54 PM
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Dont have a diagram, but if you are talking about turning the interior lights on when opening the door, it works on grounding the circuit through the door switch. There is poer to the interior light at all times and the door switch supplies the ground.
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Old 10-30-2005, 01:26 AM
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Doc here,

After Re~Reading your post and Poncho's reply (thanks Poncho )

I think your referring to the DOME or courtesy lamp (I thought you were talking about some other lamp when you said Aux Lamp..)

Poncho is correct..Pull the bulb and check for 12 volts on the center pad of the lamp holder..If not there..go to the fuse panel and replace the fuse marked "CTSY LAMP"..(See diagram)

If all thats good, put a jumper to the lamp holder from ground..it should light..If it does..look for an open ground wire between it and the door post switches..

Sorry for the confusion...

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Old 10-30-2005, 07:57 AM
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Lights on the bottom of the mirror are map lights, my wiring diagram dosen't show them but I just checked my truck and they do not turn on if the key is in the off position. Hope this helps a little...

Lance
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Old 10-30-2005, 11:03 AM
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Lance has the right lights, I figured that the map lights on the mirror wouldn't turn on unless the key were on so I did try with the key on, thanks for the help on this one guys. Much Appreciated!
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