I have a 1990 that just decided to quit starting. When I try to turn it over it clicks as if the gear on the starter is engaging the flywheel but it doesn't turn over. No hum, grind, nothing. Battery appears to be fully charged. It did this once before. I turned on the headlights to see if the battery had anything and they were bright. After that it started right up. Not now. Spent half the day putting a new starter on it and still the same thing. Any experience out there with such a gremlin?