same thing happened when I left the rear passenger window down in the rain. The carpet and a wire bundle below got soaked. It kept happening for 2 days and stopped after I dried out the cables i.e it sounds like a short somewhere.

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"