Freshly Restored
Posts: 244
Joined: Sun Jan 10, 2016 7:56 pm
Location: Edmonton, Alberta
Re: cab heather connection
I rebuilt the electric motor in this one just over a year ago when I put the heater together from leftover parts of several other heaters. The motor is an original.
I assume you are talking about the barn-door style heater:
I took it apart again to get to the motor:
The motor is made by Redmond, it seems to have markings on it '10Z4' and 'SH96'.
I previously took the motor completely apart to clean & lubricate it, and replaced the old leads with modern wire, as the old cloth covered wires were falling apart. I extended the ground lead longer than the original so I could move the ground location to something better than on the heater frame
There are 4 (four) wires coming out of the motor (red, yellow, green, black)
green and yellow are connected to the windings in the motor
green = ground
yellow = power
as well, red & black go to the brushes in the motor. In addition to the green & yellow connections,
to go one direction, red=power and black=ground
to go other direction, red=ground and black=power
Technically, it is really a single speed reversible motor, the way they get 2 speeds out of it is by using the little toaster element/resistor wire on the back of the heater switch. full speed setting doesn't run the power through the resistor, slow speed does.
hope this clarifies things