Dear Jason,
The heater element should be closer to 100 Ohms than zero. Is your meter on the “Ohms x 1” setting? You could have a solder bridge (short) somewhere around your diodes.
If there is an “on-off” switch for the heater/blower, turn it “off” as you are measuring the resistance of the heater. I assume the diode bridge is to keep the fan blowing in the same direction with changing loco directions.
Check to see if all the diodes are in the proper orientation. Left and Right rail inputs to diodes shoud each have a stripe and a no-stripe end of a diode touching them. Fan(+) should have 2 stripe ends touching it, and Fan(-) should have 2 no-stripe ends touching it.
I’m not sure of the heater circuit. It could be just a heater element, or it could have some kind of thermal cutout switch in series with a heater element.
Anyone with more knowledge of this smoke and fan circuit, please chime in.
Absolutely gorgeous results on the paint.
Great job.
Sincerely,
Joe Satnik