I've looked at the wiring and so far all looks good. I plan to re-check it all. The engine was running fine on the layout, and just died suddenly while moving. There was no derailment at the time. The engine was moving at speed step 2 or 3 and just stopped and the transformer tripped. Glad the ZW-L tripped quickly or more damage may have occurred.
Its funny that it will run in the other direction without issues. If a wire was shorted I would expect it to blow the fets in both directions. I was having a signal issue with the engine on one part of the layout. The lights would flash a bit and the engine would stutter. I've never seen a poor signal issue cause a driver board to blow. Is that possible? The engine was pulling a light load (6 modern freight cars). Maybe a motor issue took out the driver? The motors are running ok in the other direction. Really puzzled as to why the fet blew. Can a fet just die?
