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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Unfortunately this is going to be either a bad connection or a short. Something like this you already know is going to be a pain to find I am sure, I say this because there's not much you can do other then testing with a voltmeter and tracing wiring and shaking wires and tapping things to find the problem. Start with a voltmeter or test light and when these devices are not working test the fuses for power on both sides, power out of the fuses indicates the problem is after the fuse. No power means the problem is before the fuse. Shaking and tapping things, wiring etc may help isolate the location of the problem.
Thank you!- Joe
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