Power window

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Jun 2, 2012 | 09:26 PM

cars78md

Thread Starter

Cruising

Joined: Jun 2011

Posts: 14

Likes: 0

Power window

I own a 1978 corvette . pas. side window stop working. it work fine the last time i used it. It make no noise ,justed nothing. How can i tell which one is bad.the motor or the switch?

Jun 2, 2012 | 10:07 PM

Bills17n72

Safety Car

Joined: Sep 1999

Posts: 4,891

Likes: 695

From: grand rapids, lowell mi. area

well dont know how to tell if it if bad ,but if you need a new motor ,I have one out of a 79 $35

Jun 2, 2012 | 10:33 PM

1986coupe

Burning Brakes

Joined: Jun 2003

Posts: 1,079

Likes: 1

From: Niagara Falls ON

Test the switch first. Use your multimeter to see if current flows between the contacts when the switch is used. If not then the switch is done.

Jun 3, 2012 | 07:52 AM

...Roger...

Race Director

Joined: May 2006

Posts: 16,528

Likes: 53

From: Dayton, Ohio

Do you see any reaction from the dash voltmeter pushing the switch either way ?
Assuming the window is up,if you see no reaction pushing the switch to down but there is a reaction when pushed to up then its highly possible the down wire is broken in between the door and body.

Jun 3, 2012 | 10:01 PM

lvmyvt76

Melting Slicks

Joined: May 2011

Posts: 2,753

Likes: 119

From: Springfield Missouri

take the door panel off and use a test meter on the leads to the motor, one is up, one is down, ground on side of the meter to a good ground on the door or frame, should read 12volts when current is applied via the switch, no 12volt, may be in the switch. Need to test for voltage at switch then. No current there, then keep going to the fuse panel via the wiring to see where the problem is. Is the wiring going from the post into the door OK? could be broken there, then power would be at the switch and making it to the motor then. A bad ground could be the problem at the door, no ground no workie.