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First thing that pops in my head is a bad ground some where. have a look at the wiring back there. There are a couple of ground wires that go to the frame there. It wont hurt to take those wires off, clean up the frame and connector then reattach.

If you have access to a test light see if you have power back there at all. If not probe the wire as far as you can go till you find power. if your wiring is original like mine you will find all kinds of dry and cracked wiring. 

Good luck man. I hope that helps.