It’s likely the solenoid(s). To test the motor you can jumper the armature to one field winding at a time then apply power to the other field winding (leave your ground attached). One combination will be in and one will be out. You can either clean the solenoids or be smart and buy a contactor. The solid state contactors are the way to go on your electronics. If you buy a quality unit you’ll probably never have to think about it again.
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