You will get mixed messages on running a 6v on 12 volts. Mine is a 54 and in 54 they still used a 6v system. The previous owner converted to 12v and it very quickly burned up the 6v motor. I had to replace it with a 12v motor $30 from AutoZone. There is no way with a volt/ohm meter to tell what your motor is. A volt/ohm meter will only tell you what you are sending to it.
Linkt to AutoZone heater motor If you pull the heater and can get access to the motor model number you can tell what it is. I was suprized I was able to find information on my motor on Google by typing in the manufacture information and model number from the motor.
