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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: Restoredrustbucket on July 26, 2017, 03:43:51 pm
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Hi, so the courtesy and dome lights don't turn on in my 1986 chevy Scottsdale, there is power to my dome light but nothing happens when I turn the knob CW or when the doors are open, I took out the door switches to test the white ground wire and found that the wire doesn't spark when I hit it to a ground or have any power in it, it's hard to trace this wire I was wondering if anyone had a wire diagram for the courtesy lights or could just point me in the direction to where the wire starts on the fuse box, thanks!
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Power goes to the dome lamp through an orange wire coming off of the headlamp switch. The door jamb switches make a ground path for the dome lamp. This should be a white wire. Check to see that you are getting 12 volts to your dome lamp first. That will tell you if it is a problem with the power or ground side of the circuit.
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Power goes to the dome lamp through an orange wire coming off of the headlamp switch. The door jamb switches make a ground path for the dome lamp. This should be a white wire. Check to see that you are getting 12 volts to your dome lamp first. That will tell you if it is a problem with the power or ground side of the circuit.
okay, yeah the dome light is getting 12v so it is a ground problem, following that wire is a real pain, that being said what do you suggest I do?
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Remove the left sill plate and inspect the wire pair passing underneath. It's common for the wires to corrode and sever if their insulation has been compromised by a retaining screw or pinching by the sill plate. Check the inline connector in the left B pillar for evidence of oxidation. While you're there, momentarily ground the white wire at the inline connector to see if the dome lamp illuminates.
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Remove the left sill plate and inspect the wire pair passing underneath. It's common for the wires to corrode and sever if their insulation has been compromised by a retaining screw or pinching by the sill plate. Check the inline connector in the left B pillar for evidence of oxidation. While you're there, momentarily ground the white wire at the inline connector to see if the dome lamp illuminates.
I found a corroded wire! Thank you!
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