It's also very possible a window seal is leaking, allowing water to get into the wall, maybe traveling the wire to the light fixture. We had a slide window leaking this past winter, drove us nuts for a while until I put up an outside film weather barrier over the window. Stopped the leak. Turned out, there was a gap at the top of the window, where the flange with the sealant contacts the outer wall. The gap was barely enough to get a sheet of paper into, but that was the source of the leak
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Bob & Becky
2012 3402 Montana
2012 Chevy 2500HD D/A CC
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