Fixing Wiring Problems: Find an electrical schematic of your vehicle. This can be found either from information in your owner's manual or on the Internet. Trace the wiring from the fuse panel to the switch. You should refer to your electrical schematic for help. You want to make sure that there are no breaks in the connection from the fuse box to the switch. If you did not find a schematic, it might be easier to trace the wiring from the switch back to the fuse box to look for any breaks in the connection.
Attach the leads of the multi-meter to where the electrical wires come into the motor. Again, set it to DC volts and it should read 12 volts. Look for any interrupted voltage caused by a loose connector or corrosion. If there are any loose or corroded connections in the circuit they will disrupt the signal and cause your window to malfunction. Fix the connector or corroded areas. Push any connectors or wiring harnesses together tightly, and clean any corrosion away with a wire brush or similar tool. Test the window again. If your problem was in the circuitry and is now fixed, then your window should freely roll up and down without any restrictions or delays.
Your Cars Alternator. The cars alternator generates electricity which is employed to preserve battery storage charge and to lend a hand in operating the entire the electrical accessories, which includes the ignition and the engine control systems. The cars alternator is belt-driven by the engine and creates an alternating current which is transformed to twelve volts direct current by means of the rectifiers or diode bridge. In contradiction to popular idea, an alternator does not continuously generate electricity. It sequences on and off at the same time as demand goes up and down.
If your motor is functioning properly but the window is not responding, you may need to replace your regulator. Remove the bolts that attach the regulator to the glass. The regulator is the lift assembly that moves your window up and down. You will have to move the window up or down to align these bolts with a hole in the door interior. Using an extension on a ratchet, you will put a socket (usually 8 or 10 mm) through the hole and loosen the two bolts. Push the window all the way up. Use your hands to push the window up, and then either fasten it with tape or pull it out of the door altogether.