Have an old Clark that the owner wanted the starter removed and rebuilt. When I got the starter back and installed the engine wouldn't turn over. Ran a new positive cable from the battery to rule that cleaned my grounds. Pulled starter and bench tested ok. Pulled the spark plugs out to try and turn over by hand and I can't. Has anyone come a crossed this of a truck only sitting for a little over week? The old starter came out as a complete unit nothing feel down into the flywheel when I removed it. Thanks for your help.