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- 57
- 48
- Location
- Milford / Michigan
74M35A2 was changing batteries in his M925A2 last night and there is a wire that goes to the 12 volt side of the batteries with the wire number 569. He bet me lunch that the 569 wire powered the low speed of the heater blower motor. Well sure enough he flipped the battery switch and the blower turned on low speed. I thought it's bad to pull power from one battery like that. I know the 809 series did it for a grid heater for cold start though. Anyway, back to the 939 series... does that wire power the low speed of the fan and the blower motor does not have a resistor? What gives? I'm all for buying the man lunch but I don't under stand what the 12 volt wire does on the 939.