I had the same problem with our Tuscany, after tracking the video cables from the radio head unit I found Thor used a extension cable to be able to make the distance to the mirrors, check those first see if they used them, mine ended up being a broken video wire in the mirror head, probably from when the wood screws Thor used to mount the mirrors to the body came loose, I repaired that by drilling those holes up to 5/16 and used stainless bolts washers and self locking nuts, been good since.
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