I believe I need a blower regulator. I'm tryiing to make sure my diagnosis is correct and I didnt find anything in the archives to clearly check the blower regulator?

Blower worked initially when I got the car then stopped after sitting for a while (weeks) then worked for a bit and now quit.

Checked voltages at three pin connector near drivers firewall - good ground on black, 12V on red, and 1.2v to 7.5v on the yellow so I believe the interior button box is OK.

Removed blower and there is 12.4V at the blower leads but blower doesnt spin. Blower was hard to turn so I lubed bushings with ATF easier to spin now. Brushes dont look worn down to far (have spares). Hooked motor up to a power supply (curent limited 7v 5A or 12v 1.5A) it doesnt turn. Hooked it up to battery charger and it spins right up instantly (charger set at 2 amp setting but probably allows a much larger start up surge).

So I suspect it is the regulator but want to be sure befor I order a $300 part (or get a used one).

Thanks
Paul