Moisture in the Fuse Box - Diesel Forum -
1999-2007 General Questions General questions related to 1999-2007 Super Duty trucks. If it doesn't fit the other categories, post it here. Gas engine discussion that pertains to all models is allowed. Specific gas engine questions should use the Gas Engines forum.

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post #1 of 4 (permalink) Old 01-01-2014, 08:58 AM Thread Starter
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Moisture in the Fuse Box

Whenever it rains I end up getting moisture build up in my fuse box. It specifically sits near the fuse that controls my radio and consequently turns the radio on even if my keys are in the house. Has anyone else had this problem and if so what did you do to combat it?

-2004 6.0
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post #2 of 4 (permalink) Old 01-01-2014, 09:13 AM
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This used to be a fairly common problem. Obviously there is a water leak. I recommend removing the driver's side a-pillar trim and water test with a garden hose - have an assistant run water over the top of the windshield and drivers door with just an open hose/low pressure. If your truck has clearance lights include those as well. Look for water leaking from around the windshield and the driver's door weather seal that runs down the a-pillar and consequently into the dash right onto the fuse panel. It may take time to see any water and additional access to trim panels and the headliner may be required. Once corrected your next concern is damage to the fuse panel. Long term exposure to water will cause corrosion and damage to the inner circuit board and terminals.

Good Luck!

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Last edited by ford_doctor; 01-01-2014 at 09:16 AM.
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post #3 of 4 (permalink) Old 01-01-2014, 11:27 AM
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Ford Doctor is 100% correct. Once you get the leak fixed, you HAVE to address the corrosion that is already in the panel. I've had some luck with a few of the out of production boxes by removing, disassembling, drying then using a good electrical parts cleaner like De-Oxit to spray and scrub all the traces and terminals clean. Don't forget to clean the plastic of deposited corrosion as that is seemingly where a lot of the shorting of circuitry seems to happen. Takes a little patience and its a good idea to take pictures of fuse/relay location and parts as removed.

Dad always said,"Knowledge is limited but stupidity knows no bounds."
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post #4 of 4 (permalink) Old 01-01-2014, 02:32 PM
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Windshield leak. I had same problem and replaced the windshield to correct. Caught it before damage to fuse box.
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