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Originally Posted by ichbdkevin
The courtesy light and that window would be on the same circuit? seems strange but will do.
Thanks.
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What I was trying to demonstrate is that without using any tools (like a multimeter), you can get a pretty good idea what to rule out by trying this simple test.
The courtesy light isn't necessarily on the same circuit, but the current draw would affect the rest of the circuits...you can't measure that w/o a tester, but the dimming light would be a sure sign.
When you press the window switch, the motor draws current. When the window reaches it's stop limits (up or down) and you are still pressing the switch, the motor can no longer turn, but in it's attempt to still provide torque, it draws even more current...enough to briefly starve the other circuits in the car (hence, the light dimming effect).
If your motor is working but the mechanism is inoperable, the motor would try to operate, but the jammed mechanism would prevent normal operation, thus increasing the current load (dimming light). If the switches were bad, no current would be applied, and the light would not dim...make sense?