[Ray'ssporty1200]

I'm gonna say the alternator could be getting chewed up, a loose magnet tearing up bobbins of wire, if shorted, you won't get the volts you need to charge the battery. I'd pull that rotor off asap and check it out, what else could it be? It adds up, weird sound and always needing a jump.

 

[Ray'ssporty1200]

Looks like a 3 phase winding, Cmon Start is right, I'd compare resistance to what shop book says, Check from leads to stator
core to see if there are any shorts, if there is one or more shorts, less windings are used an you get less voltage.