power window question

[Teepee]

Hi Gang.
1996 explorer XLT 2wd 4 door 6 cyl. Just replaced the bushings/plugs in the drivers side window motor and now the window is once again working.
Unfortunately when the window bottoms out or tops out the motor continues to keep driving causing that KLUNKA KLUNKA sound that I have seen described here.
My question is , what tells the motor to stop driving ?
Is there an adjustment or a circuit that I should be looking for.
I'm sorry if this has been discussed and solved but I have spent more than a day now trying different search criteria .
Much appreciation
Tony

 

[Teepee]

quick update

Hi again,
Just went back into the garage and noticed this.
with vehicle engine running the power window motor keeps trying to drive the window beyond stops . causing the clunking noise.
But with vehicle engine not running and ignition in the on position the window stops and the motor does not try to keep running.
any ideas???
Tony

 

[Teepee]

power window motor

Am I asking in the correct place ?
Can any body tell me why after replacing bushings in motor does the motor continue to try driveing the window up or down