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Old 01-14-2006, 05:19 PM
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How does a dome light wire up

How does a dome light wire up?? I can understand that the ground for the dome light goes through the door switch, now do they run a another wire from the light switch to the hot side of the dome light so you can turn the light switch to get the dome light to go on, BUT how is the ground circuit closed since the door is shut and the ground switch is therefore open?? Thanks Ed

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Old 01-14-2006, 06:21 PM

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Its simple... all the switches, regardless if they are door switches or manual switchs, switch to ground with a single hot wire going directly to the lamp.
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Old 01-14-2006, 07:37 PM
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Doc here,

Ahh yes.. Another General Mystery State secret..

36SCSC is correct..

The don't tell you, or show the logic of the Lighting switch, but it appears the Dome and courtesy lamp is referenced to ground through both the door switches and the dim/ lamp control.

Here is a schematic of GM from like before the V8 to like 1980 on typical dome lamp circuit..This one happens to be 1966 Malibu

If your reading 12 volts at the black/White..It may just be because it's an unloaded ground..If your nervous about it, take a 15 amp fuse from that wire and ground it, if the light, lights, It's all referenced to ground, both from the switch and the remote door switches..If it blows ya gotta 'nutter problem..

As the drawing shows , it parallels into that wire before the lamp, so that is a pretty good clue!


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