Here is a BB smoke wiring diagram.
It is a bit different than I described in that the BB smoke unit does not use the AC regulators output feed for the motor. Some Legacy locos work this way. The BB does not.
AC comes to the smoke unit separately from the element voltage.
This means that you can have fan voltage with the AC smoke regulator not putting any voltage out. Sounds like you may have popped the fan motor circuit on the smoke unit board?
And you may have a bad AC smoke regulator board as well if you are not seeing any voltage across the element.
The safest way to measure the smoke voltage is remove the smoke output stack from the smoke unit and the element screws are under it. Measure voltage between the element's screws
The part numbers are
691ACRG104 AC REGULATOR (S04 CODE) $30.00
691SSMUK02 PCB / SUPER SMOKE (ANALOG) $28.00 ( PC Board for Smoke unit)
Carl
