07-12-2022, 03:53 PM
Charlie,
My guess is some sort of ground loop. Somehow your motor circuit is not isolated. I would probably start with insulating the DCC decoder and then check every wire connection (even the lights and accessory functions) for a stray strand that touches metal. Can be really frustrating with all of the metal in that model! Retrofitting can be really rewarding or very frustrating until it's rewarding. There's also the possibility that a short hit a component on the DCC chip and fried it open.
My guess is some sort of ground loop. Somehow your motor circuit is not isolated. I would probably start with insulating the DCC decoder and then check every wire connection (even the lights and accessory functions) for a stray strand that touches metal. Can be really frustrating with all of the metal in that model! Retrofitting can be really rewarding or very frustrating until it's rewarding. There's also the possibility that a short hit a component on the DCC chip and fried it open.
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