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I have a 2004 suburban Z71,,,with major electrical gremlins,,,when there is moisture in the air,,,everything goes haywire,,,the headlights flicker,,,the heat or ac fan goes from high to low,,,seat heater go on and off,,,four wheel drive jumps in and,,,windows wont go up or down,,,you name it...Its obvious im getting moisture in the system somehow butdont know where,,,HELP

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  • Zaraki Oct 10, 2010

    That sounds like a faulty or loose ground wire at the fuse/relay panel under the hood or at the battery, or it will be attached to the body of the vehicle somewhere, and usually it is around or behind the battery. I have even seen poor body grounds smoke and bubble after getting wet and they can wreak havoc throughout the entire electrical system, and they are also among the hardest wiring problems to locate.



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I have seen a problem like this before & the problem was at the bulkhead connector.
This is a great big plug. Most are under the master cylinder area down behind the wheel well. It's mounted on the wall right above where the brake peddle is. This plug carries in the area of 30 or more wires. It connects the inside compartment wiring to the under hood wiring.It may have been damaged or even loosened at some point to find a circuit, and then not replaced &/or sealed properly. The harness itself near the bulkhead connector may have been damaged and corrosion has worked itself into the wiring & when it gets damp enough more circuits are effected.

Posted on Oct 10, 2010


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