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03-10-2004, 11:54 PM
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#1 |
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Registered User
Join Date: Apr 2003
Location: Indianapolis,IN
Posts: 138
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Dome Light Problem?
I'm trying to figure out why the dome light in my 78 GMC isnt working. I seem to be getting voltage at the light it self,but exaclty how many volts should I be getting at the light?The entire 12 volts,or less than that?
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03-11-2004, 12:17 AM
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#2 |
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Registered User
Join Date: Feb 2004
Location: Hodgenville, Ky
Posts: 735
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the lamp has a constant 12V all the time. It is turned on by the door switches or light switch. These ground the circuit causing the lamp to light.
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03-07-2011, 05:03 PM
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#3 |
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Registered User
Join Date: May 2010
Location: Oak Harbor, Wa.
Posts: 19
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Re: Dome Light Problem?
uifan71, thanks for asking the question. I am having the same issue with my 78 GMC.
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03-07-2011, 05:06 PM
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#4 |
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Registered User
Join Date: May 2010
Location: Oak Harbor, Wa.
Posts: 19
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Re: Dome Light Problem?
NeCrOmAnCeR, thanks to you also for the heads-up on how this thing works. I had been looking around the net for a wiring schematic of the system but this makes it really easy to figure out.
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03-07-2011, 11:31 PM
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#5 |
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78K & 79C Jimmys
Join Date: Nov 2009
Location: Ottawa Ont CANADA
Posts: 7,901
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Re: Dome Light Problem?
the switch might be dirty in the jam
the ground goes threw a white wire comes into the cab with a black rubber grommet just under the dash lip at each side some people cut the wire @ the switch or fuse panel to make the dimmer switch the only way on
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John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350 |
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Linear Mode
