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Ask Don 'Mo Lurch' Your Own Que...
Don 'Mo Lurch'
Don 'Mo Lurch', Buick Mechanic
Category: Buick
Satisfied Customers: 20446
Experience:  GM, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics.
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My drivers door window stopped working. I bought a window

Customer Question

My drivers door window stopped working. I bought a window regulator with a motor and it still does not work. I checked the power source to the motor with a light. When I press the switch forup, the light goes on, the light does not go on when I press the switch in the down mode. Could it just be a bad switch and how can I purchase just a switch,
Submitted: 3 months ago.
Category: Buick
Expert:  Don 'Mo Lurch' replied 3 months ago.

What year?

This is a Reversal Circuit
When you tested the wire for UP, the Light goes ON
When you test the "other wire" for DOWN, the Light should go ON
This is likely a broken wire, bad connection or bad Switch
This is the way it should be tested

Use of a VOM (volt ohm meter) is needed to test
The way it works:
Ignition On
Switch held in Up position
One wire will have 12 Volts +
One wire will have Ground -

Switch held in Down position
The wire that had 12 Volts + is now Ground -
The wire that was Ground - is now 12 Volts +

If Voltage or Ground checks good at motor, replace motor.
If Voltage or Ground does not check good:
Check Switch Voltage & Ground.
Check for broken wires at Door / Kick Panel Boot

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Expert:  Don 'Mo Lurch' replied 3 months ago.


Expert:  Don 'Mo Lurch' replied 3 months ago.


did you need more information?
please respond or rate my answer

thank you