1990 c1500 radio off with headlights on - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 11-01-2011, 06:07 PM   #1
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Default 1990 c1500 radio off with headlights on

1990 Chevy 1500 2wd. Every time I turn my headlights on my factory radio goes off. When I dim the dash lights to nearly off the radio comes back on. I have checked the grounds and replaced the dimmer switch and still have this issue. Any ideas or help would be appreciated.
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Old 11-02-2011, 08:24 AM   #2
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http://www.the12volt.com/installbay/...etail/472.html

i would check and see if your ground and ill signals are proper. especially the ground doesnt go hot when the lights are on. its been a while but i believe the radio module in question was under the dash kinda below the tape player/eq.
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Old 11-02-2011, 10:11 AM   #3
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The radio module is on the right side of the driver behind the ashtray. So far from what I've been told, but cannot find either in the schematic or under the dash, there'* supposed to be a ground strap somewhere. No one seems to be able to say where it'* supposed to be though. All the grounds that I have found are performing as they should.
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Old 11-02-2011, 10:21 AM   #4
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you need to take the module connector off and measure the ground input at the connector, it says the wire colors in the link. looking for random grounds isnt going to help you. if you dont have ground or lose it when the lights are on you can trace that specific wire back and find out where the lights are jumping on to it. you could even just run a new ground from the connector if its bad.
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