First stop, fix the smoke unit wiring What I do is power stuff like that up with a variable transformer so it can't get maximum voltage in the case there's still a flaw. You can check the smoke element control using a 12V automotive bulb, look for one that draws 500-600ma, but a maximum of an amp. That would be a 6 to 12 watt bulb. With that across the heater outputs, you should be able to see it go out when you turn the smoke off, and change intensity between low/medium/high. If all that works, the smoke heater output is probably OK. This is also how I test TMCC and early Legacy smoke regulators.
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