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post #1 of 22 (permalink) Old 06-19-2013, 08:03 AM Thread Starter
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Window Motor Problems

I have a 1981 Vette. I have a problem with the passenger side window. I can not get the motor to work up or down. I had installed a new motor about 6 months ago and it worked fine but was extremely fast. Then it just stopped working. I took it back and ordered another one. Put it in and nothing. So, I took that one back and got another one. NOTHING. I have power at the pigtail. I even put an extra ground wire on the motor housing to the door frame to make sure I was getting a good ground. Does an 81 have a window motor regulator under the console like the 78 and older does? What could the problem be?
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post #2 of 22 (permalink) Old 06-19-2013, 08:23 AM
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are you sure its not jammed ? theres a front roller that is prone to come off and wedge the glass ..can you move the glass up and down?
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post #3 of 22 (permalink) Old 06-19-2013, 08:28 AM Thread Starter
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No I can not move the window up or down with the motor installed. Yes I can with it out.
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post #4 of 22 (permalink) Old 06-19-2013, 09:20 AM Thread Starter
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Any ideas???
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post #5 of 22 (permalink) Old 06-19-2013, 10:45 AM
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can you hear the motor trying to run? Try doing a continuity test on your switch?



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post #6 of 22 (permalink) Old 06-19-2013, 01:23 PM Thread Starter
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No, the motor does not even try to run. Is the a relay under the console like in a 78 and older?
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post #7 of 22 (permalink) Old 06-19-2013, 01:50 PM
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Originally Posted by ssclassics View Post
I have a 1981 Vette. I have a problem with the passenger side window. I can not get the motor to work up or down. I had installed a new motor about 6 months ago and it worked fine but was extremely fast. Then it just stopped working. I took it back and ordered another one. Put it in and nothing. So, I took that one back and got another one. NOTHING. I have power at the pigtail. I even put an extra ground wire on the motor housing to the door frame to make sure I was getting a good ground. Does an 81 have a window motor regulator under the console like the 78 and older does? What could the problem be?

Over the years I have found power window problems are usually caused by bad connections at the rocker switch. As far as the relay under the console goes I believe the same relay was used for all the C3's. The relay has an overheat switch that will stop it from working for several minutes any time it gets overheated. But before ripping everything apart check the rocker switch and make sure the connections are making a good contact with the switch.
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post #8 of 22 (permalink) Old 06-29-2013, 08:53 AM
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did you try running the motor before you installed it?
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post #9 of 22 (permalink) Old 06-29-2013, 06:13 PM
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With my 1980, the power windows have been a source of buying aspirin since I got the vette.
Put power to the window motor and confirm it works. Use a voltmeter and check the harness connector plug for power. Be careful not to damage the connectors in the plug when you insert the test leads. Don't go from one of the leads in the plug to a ground on the car, keep the 2 test leads on the plug. When you work the switch, a digital voltmeter will read power if the switch is working. When the meter shows a negative symbol in-front of the number, it means the polarity reversed for the window to go in the other direction. If you don't get correct power at the plug, you need to check the wiring to the switch.
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post #10 of 22 (permalink) Old 06-29-2013, 06:37 PM
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This is a power window wiring diagram for a '75. Maybe there are similarities. Hope it helps.

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