Hello. I have some charging issue on my bike. The charging is very intermittent and mainly only when I start driving. Possibly getting lower due to heat? Getting between 8 and 13 VAC between the coils when the engine is running, from idle to 4000 rpm, and this is pretty stable even when having run for a while. Output from reg. is up to 14.6 VDC in the beginning, then after some minutes it seems to drop to zero and then the bike is only running from the battery until it