problem with old power window motor

Is the brush rigging mounted on an end bracket? If so, perhaps you re-assembled the motor with the brushes in the wrong position; i.e., ninety degrees from where they belong.

Roby

Roby, the brush rigging is indeed mounted on an end bracket! This could very well be it... I'll get to it this weekend, and report back.

Thanks! Dan

Another possibility is there is corrosion on the iron armature and /or the stator leaving an insufficient gap, therefore rubbing.

And in fact, that's what it was. It turns out that the 4 retainers for the brush plate form a rectangle, not a square as I thought; there was no possibility of me mounting it 90 degrees advanced or retarded.

But, there was play in the shaft, which centered the armature in the field magnets when energized, lifting it enough out of the rear bushing to where it rubbed on the stator. I placed some washers on the one end to remove the play, reassembled, and it's running! Both forward and reverse...

Thanks, gents, for your most excellent replies.

Dan

Good job, Dan!

You really ought to look at the newer cars, though. The dashboard clocks are a lot more reliable and they don't use tubes (or valves) in the radio anymore.

Roby

Yes, but you can't these newer cars up to 90 mph in between gas stations! 8^)

Dan