[Latitude 28]

I'll run some voltage tests today with different Tstats and fans and let you know what I see. You are welcome to come over any time and look, check, tinker since our coaches aren't too far apart in serial numbers.

Thanks Richard....I appreciate the help and offer.  I did make contact with Rudy just haven't connected with him as of yet to find out what  those black cube relays control and if it was a AH modification done in the field since my serial number AH unit is not supposed to have them.

I am thinking the original T-Stat behind the passenger seat has been abandoned as the wires do not match the wires on the AH T-Stat terminal block and has no effect at the AH.  The Hi Lo switch does work on the heat exchanger fan under the curb side couch, but no effect on the toe kick fan which runs continuously. 

Out of curiosity, does your AH have those relays?

Thanks Steve