I have a 1976 55 hp Johnson seahorse and i just bought a used johnson throttle control unit with key ignition that works. when i turn the key all i get is a click in the solenoid but the starter does not engauge. when i trip the solenoid it engauges the starter. I have never tried to start the motor with a ignition switch because i never had one till now. so i was woundering why the starter may not be engauging by the ignition and if it is a solenoid problem or not.