Thanks to you both. I use Lionel Powermasters to keep 18 volts in the track. I do my best to not let my smoke units run dry but as most of its know this is sometimes difficult due to evaporation and many locos to remember. Perhaps a good inventor (are you listening John?) could invent a dip stick or strip type device that would let us know the status of smoke units. Like those used to check the status of pool or hot tub chemistry.
Just so you know. I removed all the plugs from the driver board one by one and checked each time is the short was eliminated. I finally removed power from the pickups to the board and the short ended. So I have concluded the short is in the board itself. I tested the smoke unit from the 38702 and both fan and resister seem ok.
Could a bad thermistor cause this kind of problem? Not sure what this is?
