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Take it off the vehicle. Put it in a vice. Get a battery charger. Attach the positive cable to the large post on the back of the starter solenoid. Attach the black post to a ground point. Take a test lead or screwdriver and make a closed circuit between the large post at the back of the solenoid and the small one. If it functions as it should normally, it might be fine. If not, you know it's faulty. If the starter engages the flywheel briefly, but then spins freely, your solenoid is going bad.

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Q: How do you know if starter motor is faulty?
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