im trying to help my brother fix his screw up he switched out his starter solenoid and after doing so he started it to make sure he did it right. and it started just find but when he turn the key off the motor kept running until he unpluged the batt. then when he went to pug the batt. back in . it started it cranking again this time with no key. so he thought he hooked up the starter solenoid backwards and flip the wires around and now their is no power to nothing and then back and nothing still what happen here