The fan unit is wired seperately because your engine is running on A/C power supply and the smoke fan is D/C. your fan motor should be wired to a board in which The A/C power is driven thru the board and refigured to D/C before reaching the fan motor. If you unplug the fan motor and hook it straight up to track power it will run eratic for a few seconds then it'll pop with a whisp of smoke never to run again. The smoke unit can be rewired to puff with a two wire swap and a little resoldering on the smoke board if you have a sound board with chuff sound. Heres the easiest safest way : Take a 1 amp chuff switch and splice it directly into the power side of your fan motor then mount the chuff switch inside the steam chest where a drive rod can move in and out to activate the switch. Hope this will help you on your quest for the puff.
Thomas
