Got a 421 4mill serval recently tore it down to redo frame, after I put it back together it wouldn't start so checked everything good and all was hooked up right, pulled everything but motor again cleaned all ground points and still nothing, so ran a ground wire from case to frame this morning as I was told that is probably my problem sneak I pulled harness and checked everything on it and still nothing so I am thinking it's either kill switch or coil? Ran perfect before im stumped! If their is any other info ya need please ask!