Start working backwards from the starter. First by running a boostercable from your battery (pos) to the terminal on your starter motor (not terminal on solinoid).If starter turns over you eliminated it as theproblem. And keep working backwards in the system. Next would be solinoid, arc with a screw driver from the large terminal on the solinoid to the small term on the solinoid. If the starter turns over solinoid is not the problem. Keep working backwards ........