dome light power, 1st gen

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dome light power, 1st gen

Postby ChevelleFan » Mon Dec 26, 2016 10:58 pm

Can anyone help me a little with a stupid simple wiring question? The dome light in my '85 Blazer is dead. Test light shows I have no power. Everything else seems to work fine. The lights under the dash come on when the door is open as expected.

Looks like an orange wire. I found this post, which seems to confirm an orange wire should be always hot (and the door switch / dimmer switch would provide path to ground), viewtopic.php?f=41&t=33916

Where would I find the end of this orange wire that gets hooked to +12v? I really don't wanna take the headliner down if someone can give me a clue.

Thanks,

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: dome light power, 1st gen

Postby Rickracer » Tue Dec 27, 2016 6:44 am

I think that wire plugs into the fuse panel under the dash. I tried looking up the diagram for that, but they are sideways and very small, they only way I can see them clearly is to print them, and no printer at home.....but look for that wire coming from the a-pillar and see if you can find it, if it plugs into the fuse panel, it's fuse may be blown, although it should be on the same fuse as the courtesy lights, or...it may be unplugged for some reason. 8)
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Re: dome light power, 1st gen

Postby jayyk31 » Tue Dec 27, 2016 3:08 pm

That wire plugs into a female connector right next to the seat belt connector under the driver side dash below the fuse panel. There should b 2 loose plugs and they should b ran under your carpet, under and through the driver side front seat to the back and up the rear driver side wall. I have a clear diagram I can post shortly for u. It's from a '92 but should b the same.
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Re: dome light power, 1st gen

Postby jayyk31 » Tue Dec 27, 2016 3:15 pm

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Re: dome light power, 1st gen

Postby ChevelleFan » Wed Dec 28, 2016 10:12 pm

So, I found the plug into the fuse panel that was mentioned. Did some quick probing with my multimeter and I'm more confused now. The wire down at the fusebox is orange, as expected. Up in the dome light, (bulb removed), the end that I get continuity with is white with an orange stripe, and the other end appears to be solid orange. It's a little difficult to test further since all the electrical is unhooked in the engine bay, so I'll wait till I have it back together to go further, but thanks for the tips, they helped.

-Dave
'85 S10 Blazer -- 350 Vortec w-220/227, 700r4/3.42, ZQ8 suspension -- in progress!
'70 Chevelle -- ZZ383 efi/700r4/3.55, 12.18 @ 109
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Re: dome light power, 1st gen

Postby SBC CAMEO » Mon Jan 02, 2017 1:48 am

The dome light is "ground" switched...

Meaning there is a constant positive and the door switch actuates negative.

You should have positive at the orange wire at dome light.... and negative at o/w wire when door is open or headlight dimmer is clicked on.
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