Hello i just bought this vehicle. changed the fuel pump and drove it home. took the drivers side door switch unit out to check why if power window on drivers side was getting power with a test light and when i touched the power leads on harness the horn started blowing and would not go off. After i unhooked the battery and waited and hooked battery back up noticed headlights were stuck on. i started the jimmy and it started no problem but after about 30 seconds the starter kept engaging and unengaging while running. any idea what the problem might be?