On my S1 landrover, I have an aluminium panel that is pop riveted to the body and is now not electrically connected. First rule of caravan (aluminium) electrics, check the earth. A lead from the battery negative-earth to troublesome fitting. As Wharfdale said it is always the earth, so check it first. If it doesn't work leave it on until you find the fault then remove it. It might be the earth as well. I know, I've been there! Good luck Stay safe.
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