From the first steam powered coaches to today's super-cars, an automobile is a vehicle that undergoes constant changes and improvements. The first cars that were invented could barely replace the horse, were not reliable and didn't show any promising future. But people who were visionaries kept the idea alive, pressured forward thus making the car a irreplaceable part of our lives.
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.
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.
Engine analyzer - This vehicle diagnostic tool is absolutely essential in any car repair shop. It is used to test important aspects of any engine like primary and secondary ignition timing, carburetor integrity, soundness of the battery charging system, emission levels, efficiency of the fuel system etc. The engine analyzer is also called a scope and is very useful in subsequent tuning procedures after a complete overhaul.