[djimellis]

Can you be more specific about when the problem started. The original post said "lately". Do you mean on its own? After the switch change?

Definitely after the switch change. I was installing a new tank monitoring system which required smaller switches than stock. When I changed all 4 switches everything worked well except the exhaust fan, which ran backward. Since then I have disconnected all the switches and bypassed the exhaust fan switch, but still runs backward. There is only one wire to the fan which is power (+12.5vdc)
Finally had to remove the motor, checked it by attaching directly to battery. STILL RAN BACKWARD! Even the direction indicator arrow on the body of the motor says it is operating backward. Had to reverse the leads to make it run correctly. Anyway, my frustration is at bay but my mind continues to think WHY? Must be some problem internally.
Thanx for listening.