Been working on a '67 Yamaha YL2C. Its running and (finally) on the road but I have a weird charging issue. It has a charge light that tells you if the generator / alternator / mag / whatever you want to call it is charging the battery. Turn the key on, the light comes on cause the engine isnt spinning. Start the bike, the light goes out. However, apparently the battery gradually looses its charge and the light starts to come on really dim. This will continue to the point where the headlight barely lights and the engine will start to missfire cause the coil isnt getting enough juice. Here's the odd part: when the light comes on, it gets bright at higher RPM (should be charging BETTER at high rpm?) but at just higher than idle it goes out (meaning its charging). Havent actually measured the voltage yet, but anyone got any ideas?