Topic: Can a 2 wire heater blower be rewired to a three wire for a 2 speed harness

[Ogresko]

Is it possible to change the blower motor from a 2 wire to a 3 wire. My Jan 65 fastback has the two speed switch and harness and no resistor wiring. The heater box must have been changed out by a previous owner and left not working as it has a 67 date stamp on the fiberglass housing. I notice the other day that ACP now has a more correct looking early blower motor. But being in Canada with our dollar so low it is a bit expensive to replace so thought wiring would be an option

[midlife]

Yes, it is possible but boy, it is a PITA.  I've done it twice and swore it is simply easier to swap out the earlier 65 (two speed heater) for the later (three speed heater) underdash harness.

You'll also may have to change out the engine gauge feed harness (I believe) due to the wiring changes on the engine side for the heater, but maybe not.  I"d have to do some research on that to be sure.