I need help diagnosing a problem

I have a 94 prelude running h23 motor,....the problem is that when i turn on the engine, sometimes the engine only cranks. I've done electrical diagnostics on starter, AC generator(alternator), battery cables and yet found nothing. I've come to the conclusion that it might be the flywheel that's causing just the cranking. The teeth on the flywheel must have been chewed up somehow because when its cranking, its cranking pretty strong. A friend guessed that its the flywheel because when the pinion gear meshes w/ the flywheel, the pinion gear's got nothing to grip to, so it' just spins on empty teeth. Does anyone think its something else?

Please help me all Lude lovers out there......and thanks to all those who respond w/ ideas.

Flying Daggers

I don't know WTF you're saying with the flywheel theory but your problem sounds more like it's the main relay.

Are you saying the starter turns but the engine doesn't crank? Because that's what would happen if your flywheel had no teeth, and you'd hear some nasty grinding and your starter would over-rev itself to death.