1989 GMC SUBURBAN
172,535 MILES
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NELSON89GMC
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last yr we had all kinds of probs but then figured out the computer was bad and had it replaced,,, ever since then interior dome lights will not work and when car is shut off and started the clock and the radio reset everytime .. thinking maybe a loose ground wire somewhere need to know how to track it down or what else do you guys think it could be,,, need to pass smog and also want to know if something like this will make it fail smog. any info please thanks jamie
Feb 12, 2013 at 9:32 PM
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JDL
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Those issues shouldnt effect a smog test.
Stereo radio has two voltage circuits. One circuit for clock and radio memory. The other voltage circuit to play the radio. Note the fuses in the diagram.
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Feb 12, 2013 at 9:47 PM
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JDL
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The computer shouldnt have anything to do with radio or interior lamps.
Feb 12, 2013 at 9:49 PM
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NELSON89GMC
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JDL that is why we were thinking maybe one of the ground wires could be loose or something because before the guy worked on the truck fixing the computer these two things were not problems..., what do you think thanks for the diagram
Feb 12, 2013 at 10:20 PM
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JDL
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Id use a voltage tester, check for voltage at the fuse circuits. Then check the voltage wires at the radio for voltage. You can see the voltage wire colors in the diagram. The ground for the radio is black wire, get at the radio wiring and try a redundant ground, see if it helps.
Feb 13, 2013 at 2:05 PM