Dome light switch

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Sep 9, 2025 | 03:04 AM

ADELEANDRE

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From: LA ROCHELLE

Dome light switch

Hello everyone, can someone explain to me how the dome light works originally ? I don't understand if there is a switch and if there is, do you have a picture?

Sep 9, 2025 | 03:35 AM

1966F100SC

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Turn the headlight **** on the dash all the way to the left. Twisting it clockwise originally would dim the dash lights.

Sep 9, 2025 | 04:34 AM

ADELEANDRE

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From: LA ROCHELLE

Ah, ok! I installed a new LMC headlight button and I think the function still exists on the new one because I had a terminal left over that I didn't know what to do with.

Sep 9, 2025 | 04:36 AM

1966F100SC

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That most likely is the one for the dome light, I would reference mine but it’s a couple thousand miles away, but if my memory is correct…

there are also wiring diagrams floating around the interwebs for these trucks, I’ve found them very useful

Sep 9, 2025 | 04:47 AM

ADELEANDRE

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From: LA ROCHELLE

I rewired everything adding fuses and relays based on the original wiring harness and all I had left was this unknown dome, now basically everything is fine !