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Old 03-04-2012, 09:00 AM
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7.3 It rained & my electrical system is dead

I have a 99 7.3 4x4 CC with 180K miles. I've noticed over the last few years my door open chime/alarm works intermitently. During wet weather, it chimes but sounds funky. Dry weather it doesn't make any noise. Anyway, It rained a few days ago & I went to start my truck in the AM, but nothing. Both batteries are dead. The barreries are good BTW. Is there a possible known part that goes bad or acts up in wet weather? Thanks for any help.
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Old 03-04-2012, 09:18 AM
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Sounds like the gem module under the hood got wet. I think its near the brake booster area.... water can get in there and cause issues. I bet it shorted out and caused your batts to drain. Are they really drained, or is the truck not turning over because of the module getting wet.

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Old 03-04-2012, 10:54 AM
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Thanks HVAC for your response. My truck is so dead, the needle on the voltmeter won't even move from the 8 volt mark. What's the GEM Module? What does it look like? How many wires go to it? Thanks man!

PS: My windshield does have small leak toward the top just about inline with the steering column. Not bad but I'll occasionally get a streak of water down the inside of the winshield.

Any pointers to diagnose if it's the GEM module?

Last edited by bills68camaro; 03-04-2012 at 11:10 AM. Reason: added info
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Old 03-04-2012, 11:32 AM
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Gem module is what controls the locks and the overhead console stuff and other things. I am not sure where its at, what it looks like or anything. Maybe someone will chime in. Always can Google it and see if pictures are avail from other forums.

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Old 03-04-2012, 11:32 AM
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Oh, yeah, leak in the windshield would cause problems,

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