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Hello, my name is XXXXX XXXXX I can help with this problem.
The best way to test your window circuit is at the connector for the window motor. You will need to remove the door panel, access the motor, and disconnect the connector.
With a test light, attach to both of the terminals in the connector with the 2 ends of the test light. Turn on the ignition switch and operate the window switch up and then down.
The test light should light up both directions that the switch is pressed. If it does, you need a new window motor. If it does not, you have another problem in the circuit such as the switch.
Hope that this answers your question.
yes you can, most parts stores sell items such as that. Just a simple, inexpensive 12v test light.