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Reply to "MTH 20-3527-2 Runs fine smoke off. Runs jerky smoke on - FOUND CAUSE?"

Well, you might need to go back and revise what you are seeing.  IF this runs perfect all the time with smoke off, then more than likely it is the smoke unit.  Usually the fan motor is going bad and either too electrical noisy or drawing too much current.

If you are getting 3 amp spikes, that is not a poor ground, and would not be a smoke fan motor.  PS-3 can draw high current if the motor binds and the board raises current to try to maintain speed.  And of course there can be issues with data line connection between tender and engine since PS-3 is a 2 board system.

I am not sure what you really have, and troubleshooting assistance over the computer really requires an accurate input.  G

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