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Old 10-09-2011, 08:13 AM
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Dome light

NEED HELP! I have the painless 12 wire fuse block and also have a 2 wire dome light. Dont understand what to do with the two wires. Says to hook up wire from fuse block to power source B+, but I dont understand what the power source is Cant get it to work 1939 ford GM column, GM headlight switch. I am not using door jam switches, only headlight switch control for the interior

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Old 10-09-2011, 08:51 AM
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Moving this to the Electrical forum.

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Old 10-09-2011, 09:56 AM
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isolated ground,

With out the door switches, ground the socket and the wire to the filliment goes to the switch. If it's the twist to turn on the dome lite , seperate switch on the dash. find that wire from the switch for the power. No fancy stuff like touch the door handle to turn on the interior lites or light to come on when you open the door and stay on until you insert the key. just the 50's style wiring. .
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Old 10-09-2011, 10:11 AM
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Dome light circuits are pretty simple

One wire powers all lamps in the circuit and is 'hot' all of the time.
The ground wire is tied to the ground side of the lamps and is routed to connect with the door switches and the headlight switch.

Grounding this wire at any location (Door/Headlight switch) will turn on the interior lamps


The door switches just ground the wire when the door is opened.
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Old 10-09-2011, 10:17 AM
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Painless wiring (Not so PAINLESS) has used a white wire for the power side of the dome lights.

Dunno why as most of their wiring leans to GM color coding and GM has either used Black or Orange for the Dome/courtesy circuits since the 50s and the WHITE wire was ALWAYS a ground wire.

I'm gearing up to wire a guy's 66 Pontiac with a Painless 18 circuit kit.
Not finding it painless at all so far--------too many modifications to make for it to look 'right' in that car.
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Old 10-09-2011, 05:15 PM
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Painless indeed uses white for hot on the dome circuit and black for the ground. I believe on the GM headlight switch it is the terminal that is off-set from the others and is the ground. In order for it to work right you'll have to run the white wire to the dome light and it will be always hot, the run the black wire to the head light switch and splice it to the other side of the dome light...... at least that's how I wired my painless to my 67 Camaro
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