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Your breakaway switch might be inop being the trailer is 34 years old but like Al said, your house battery must be charged for it to work that way. You can hook your tow vehicle to the trailer plug and have somebody apply the brakes while you listen near the wheels for a click or humming sound to see if you are getting voltage back there. I would first make sure the trailer plug is wired correctly and matches the tow vehicle wiring (that might solve the running light problem too). I believe there is a thread here that outlines the procedures in detail including checking for the correct voltage.
Randy
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