I have a pretty nice 72 kaw 90 streetbike (dont know the model). It doesnt seem to be charging correctly. It has a new battery which according to my DVM shows about 6.25V with key off. As soon as I start it sometimes it will jump to 6.4 range but within a few seconds falls below battery voltage & continues to drop. And it may even go lower if I rev it up. Any thoughts on where I can find wiring diagramn & diagnostic help?