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I doubt the polarity matters. Neither wire has continuity to the housing of the actuator, and unless there is a clamping diode across the coil, it won't care what direction the current is.

Good observation about the actuator light not coming on until the fault reset switch has been activated. I have started my 805B so many times that I don't even think about the procedure and sequence anymore. Good reminder.

According to the TM, if the speed sensor light flashes while cranking, but the actuator light doesn't come on, and the overspeed light isn't on, the speed control module needs to be replaced. I suppose you could try performing the overspeed reset procedure to see if it helps. Maybe the overspeed...

AC voltage specifications in tech manuals are fairly useless for things like variable reluctance sensors unless you know what kind of volt meter the spec was originally developed for because the output of the sensor isn't a sine wave. If you're using a "true RMS" meter, and the spec was written...