My GL1200 has a problem with low power upon cranking the starter. I put it on my Batt Tender overnight and it holds charge, then the bike starts and runs fine, but after a while if I stop and restart it, it cranks slow then barely just has enuf juice to restart. The previous owner told me he put a stator in it, and a battery, but then it sat for awhile as it needed a cylinder head. I have like 12.9 volts at idle, around 12.2 before starting the bike, and like 13.8 at 3000-3500 RPM, anyone know what volts should be at 3500? Thanks. Im thinkin battery?