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01-11-2013, 11:23 PM | #1 |
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Location: Clute, TX.
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Dome light electrical problem
Ok I have a problem. My DOME LIGHT, it comes on when I close the door and goes off when I open the door. The dome light under the dash works correctly. Here is another problem. If I turn the the headlight switch all the way to turn the dome light ON, the dome light goes off and comes back on when Ai turn it back as if I were dimming the dash light
This is the damdest thing I have ever seen, I just don't understand it. Posted via Mobile Device
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01-12-2013, 12:06 AM | #2 | |
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Re: Dome light electrical problem
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01-12-2013, 12:58 AM | #3 |
Home Built '87
Join Date: May 2010
Location: Calgary, Alberta Canada
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Re: Dome light electrical problem
I think you might have a problem with the switches in the door jams if the under dash lights work coprrectly and your dome works backwards.
As I recall, when the door is open the door jam switch is extended and that completes the ground circuit necessary to turn your lights on. Or you have a connection somewhere in reverse, have you changed any of the wires lately? Maybe trying 2 new jam switches might be an option for you?
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01-12-2013, 03:27 AM | #4 |
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Re: Dome light electrical problem
The door jamb and headlight switches close the ground for all the floor (courtesy) and dome lights.
I'd look at the headlight and LH door switches. This is the 1989 dome light circuit. The power pickup point varies and some trucks don't have a key buzzer... but everything else should be pretty consistent from 73-91.
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01-12-2013, 09:05 AM | #5 |
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Re: Dome light electrical problem
I have not messed with any of the lights. One other thing I did notice, if I turn the outside cab light on, the inside dome light dims alot.
I will probably just go ahead and change the door jam switch its a cheap try. I did have it out awhile back but put it back in, I was getting the dome to work. As far as I can tell, this just started. I only drive the truck on the weekends and it was last weekend that I had worked on the Poly Mounts, so I don't think the dome stayed on for a week and the battery not be dead Posted via Mobile Device
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01-12-2013, 10:00 AM | #6 |
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Re: Dome light electrical problem
This is the cargo light diagram.
Its' teed into the power and ground from the dome courtesy circuit so it should stay off unless a door is open or the headlight switch is spun to the dome position.
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
01-13-2013, 02:48 AM | #7 |
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Location: New Hampshire
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Re: Dome light electrical problem
The dome light and the dash illumination (back lighting for the instrument panel) are grounded through the casing of the headlight switch.
Make sure your H/L switch is tightly fastened to the steel of the dash. If that doesn't help, try a new/different H/L switch. Also check your overall system voltage. If it is too high (i.e. more than 14 volts) your alternator may be overcharging and that will also cause the dome/dash lights to act up. Last edited by chengny; 01-13-2013 at 03:00 AM. |
01-13-2013, 06:30 AM | #8 |
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Re: Dome light electrical problem
It also grounds to the door switch holes. If the grounds are dodgy then you'll get odd behavior.
Does the dome light up with the door closed and the cargo light switched off?
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1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
And please let us know if and how your repairs were successful. |
01-13-2013, 09:09 AM | #9 |
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Re: Dome light electrical problem
Yes it does light up. If I turn the cargo light on, the dome light dims. I'm thinking the door jam switch might be the problem, not sure, benn working on my sisters car and my daughters car all weekend. I just pulled the bulb from the dome light for now. Might mess with it today but IT'S RAINING AGAIN and it suppose to BE COLD AGAIN
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01-22-2013, 09:57 PM | #10 |
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Re: Dome light electrical problem
Ok, I found the problem. One of the wires in the dome light, I guess over the years, was barely touching the medal where it was cut out to fit. Well over the years , wore the wire bare in a tiny spot, you could se a very minor arch spot. Blew the fuse for the Horn , the Radio and yes, reversed the polarity (?) on the dome light causing it to turn on with the door closed and off when you opened the door. I bent the wire a bit and put in a new fuse and all is well.
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