I have a 70 Chevelle with power windows. The window came down, but it will not go up. How can I tell if it is a bad switch or a bad motor. How do I get to the switch, and how do I get to the motor if needed?
Power windows and door locks work by reverse polarity. To get the window up one wire has 12V and the other is grounded. To get it to go the other way the one wire that had 12V is now a ground and the other will have 12V instead of a ground.
You should be able to unplug the motor wires and put on a test light across the two wires going to the switch. Press the switch one way and it will light up. Press it the other way and it will light up again. If so the motor is bad but if the light only lights up by pressing the switch one way then the problem is in the switch(s).
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