I want to put in this old underdash heater in my 46 Stude M5, but cannot find any information about this motor. It is 12vt. The black wire goes to one brush, the yellow to another brush, the orange and green wires go to the fields. I searched online, but no luck. Sent from my SM-G935F using Tapatalk
I would just get a battery and start playing around hooking up the wires in the various combinations and permutations you can come up with. Write down what you have tried each time until you come up with something that works.
It looks like the wiring in my old International. The motor reverses for defrost or heat. I think some old Fords were like that also.
You may not be 'seeing' all the connections; there may be internal connections between the wires also. If the connections are no more than what you say, it's probably a reversible motor but I'd be a bit surprised that would be the case. More likely it's a multi-speed motor, most likely a three speed. Best way to figure it out is to use an ohmmeter and measure actual resistance in ohms between all possible combinations of the leads and record each value. Check to the housing also. If there's no continuity between any of the 'brush' leads and 'field' leads or to ground (the housing), only between their respective 'pairs' then it's a single-speed reversible. Connect the 'brushes' to 12V (and I'm assuming the black wire is negative/ground), then by 'flipping' the 'field' connections to 12V you can reverse rotation. If you do find continuity between the field wires and the brush wires and/or different values from a given field wire to a brush wire it's multi-speed. You'll need a multi-pole, multi-position switch to control all the speeds.
The Jalopy Journal
