Mainsail
Member
After sitting overnight I checked it this morning before work- 13.0 volts. So it's not like the battery acts as though it's weak and I'm having difficulty getting the bike to start, no, it fires up strong every time.... until it doesn't.13.something sounds too high for a resting voltage on an old stock battery. You need to let the battery sit unused for an hour or so, then measure the voltage.
That seems indicative of a loose plate inside the battery. I've had this happen in a Ford Ranger I owned some years ago. It would load test fine, it would start fine, until it didn't. Then, after a jump, I'd run down to the auto parts store and they'd load test it again, and it's good because the plate that was shorting out moved back to where it belongs during the drive, eliminating the short.
Anyway, the new battery is on its way from Oregon- I expect it'll be here today or tomorrow.