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#1 |
Registered User
![]() Join Date: Oct 2006
Location: Ohio
Posts: 967
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Question About Interior Cab Light - 1959 GMC
Can anyone tell me what activates this light? I don't see a door switch, so I'm guessing it is turned on by the headlight switch. Any help is appreciated.
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#2 |
Registered User
Join Date: Jun 2006
Location: Idaho
Posts: 8,800
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Re: Question About Interior Cab Light - 1959 GMC
You are correct. The wire to the lamp is a ground back to the switch. You can add a relay and door switches to get it to work automatically, that is what I did.
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#3 |
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Join Date: Feb 2016
Location: Hebron
Posts: 1,157
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Re: Question About Interior Cab Light - 1959 GMC
What i did to my interior light was to run a ground to the body and the other to a toggle switch mounted under the dash. Of course you have to run power to it. its not automatic but then I know where the switch is. I did this to eliminate wiring to contact buttons in the door jam. just another way is all.
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#4 |
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Join Date: Jan 2012
Location: Motown
Posts: 7,680
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Re: Question About Interior Cab Light - 1959 GMC
the dome light in most gm precomputer vehicles has 12v+ to the bulb and grounds thru the headlight switch
cars also ground thru door pins, while our trucks don't have door pins the switch is designed for grounded dome light this is the task force headlight switch ![]() old trucks had pretty basic wiring, base truck had no fuse panel, no radio, no heater and vacuum wipers all lighting on the truck was protected by the headlight switch, the small fuse is for instrument panel lights the rest of the lights are protected by bimetal strips you see on the headlight switch picture when they had an overload the bimetal would heat up up breaking the points, cool and restore power this prevented total loss of headlights while driving, the headlights will flash if the truck was ordered with a heater it will have an inline fuse as accessories were added: radio and electric wipers, gm added a 4 fuse panel behind the headlight switch
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#5 |
Registered User
![]() Join Date: Oct 2006
Location: Ohio
Posts: 967
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Re: Question About Interior Cab Light - 1959 GMC
Great info. Thank you all!
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