Hi, I been quiet until today when I decided to take a peek at my rear
windows, and find out why they quit working. These motor assemblies are
sealed units that are sealed by melting plastic rivets, and they are easy to
pop apart. On the one I took apart, the motor was the culpret. At 12 volts
to the motor (gear disconnected), should draw about 0.15 ampere. Mine drew
0.5 amp in one direction (spinning), and > one amp in the other direction
with the motor stalled. This seems to answer why the motors can shut the
window better than open. Anyway there is a current limiting pellet in there
that when hot, it's resistance rises, and the current drops to protect the
motor from burning up when stalled. This is a PTC thermister.
I took my motor apart (not too easy), and cleaned the brushes, and
commutator as best I could with steel wool, and a small round file. After
putting things back together it worked great for a while, and the no load
current was about 0.15 ampere in both direction with hi rpm from the motor.
The motor quickly went back to normal after opening, and closing the window
a few times. A quick Google search for the motor popped up this link:
I ordered two motors for $4.50 each + 3.00 handling, + UPS 5 day ground.
Hopefully I'll have an update in a week.
I wonder what mother mopar charges for these motor assemblies?