Checking Electric Motors (Mitsubishi Colt 4)

Electric motors perform many functions in a car:

Check or replace the electric motor fuse.

The electric motors of the electric window lift and sunroof have automatic fuses that switch off due to overloads and switch on after a while. The reason for the deviation may be frozen glass or dirty window guides.

If the fuse blows again, it indicates a short circuit.

To accurately determine the motor defect, connect the motor with two wires, about 2 mm in diameter, to the battery. The positive wire to the positive terminal, the negative wire to the negative terminal of the motor. If the motor runs well, then the defect was in the power supply. Slow and intermittent rotation of the motor indicates worn carbon brushes. Replace the brushes.

If the motor is running, determine (from the electrical diagram) the wire that supplies power when the switch is turned on and before that the ignition is turned on.

[The article is reprinted from this source MitsubishiMan]

Check the current-supplying wire. As a tester, you can use a regular incandescent lamp, with a sharp needle at the end of the wire that you can dig into the wire.

If there is no voltage at the motor terminals, there is a defect in the power supply. Determine the defect using the electrical diagram and eliminate it. Motors are often switched on via an intermediate relay, so the relay should be checked.

Finally, check the switch.

If the wire is damaged, it is better to lay a new wire.