Question about 1991 Chevrolet S-10 Blazer

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The rear cargo light won't turn off. This happened after I replaced a rear turn signal tail light bulb and a fuse for the horn. (These went out at the same time.) When the blinker light and horn were repaired the cargo light remained, on no matter what. I took the bulb out as a temporary fix there. Are these related? How do I fix this?

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Hello! The instigator of this problem appears to be the the rear cargo lamp; Official name is rear dome light. You'll need a multimeter set on the X10 ohm scale to shoot this trouble. Leave the rear dome light bulb out. There are two switches involved; #1 the rear dome light on/off. #2 the right hand front door switch.

Pull the horn fuse out, remove the rear dome light cover, drop the rear dome light down to access the wiring and close all doors on the vehicle. Connect one lead of the ohm meter to the white wire and the other to body ground. If you read any resistance one or both of the two switches (dome light switch or right hand front door switch) is remaining closed when all doors are closed. Next disconnect the black lead from the dome light switch and see if reading changes to zero. If it does this is indicating that the dome light switch is defective. If it does not, disconnect the right hand door switch and take another reading at the same location. If you still measure any resistance, the black wire of the rear dome light is shorted to ground, if not then the right hand door switch is the culprit.

The reason the right hand door switch and not the left hand door switch is involved is the fact that opening the left front door would turn on the front dome light as well as the rear light. If both dome lights are staying on with all doors closed I would then involve both door switches in this test procedure. If your vehicle is a four door model then disconnect one door switch at a time while performing this test procedure.

The horn fuse also supplies power to the rear dome light, and I suspect the two events are related.


Guru..............saailer


I’m happy to help further over the phone at https://www.6ya.com/expert/david_6df67de3b14de867

Posted on Dec 13, 2009

Testimonial: "Thank you - that was very thorough! Since my right front passenger window motor needs replacing this makes sense. "

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Sounds like u lost ground in that cargo light,as long as the interior lights are working alright with the switch

Posted on Dec 13, 2009

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