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Now to troubleshoot the TM end.
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Larry -
You need a clamp-on DC ammeter, to see if current is flowing to the magnets - both magnets. In my TM, I went behind the refrigerator, and separated the wire going to the brakes into two wires, one going to each brake. That way I can measure each brake individually, without having to crawl under the trailer. Quite a relief for my not-so-spry body! A clamp-on ammeter, of course, is part of a clamp-on multimeter, one of the handiest things you'll ever buy. For TM or automotive work, make sure it has both AC and DC capability.
Clamp-on AC ammeters are common as dirt, but a clamp-on DC ammeter is another thing. In the Trail Manor Technical Reference Library, I discussed how to choose a clamp-on DC meter, and described one that I have, and like a lot. In fact, I have two of them, one at each end of the country.
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Bill