Look inside the wiring chart... It is the yellow cable that is elongated with the red on to the right solenoid post. From there the black cable goes to the battery I think. There you have your connection.What has me so puzzled about my charging issue is I've had multiple people say that there should be a wire from the alternator the the battery
Is the black-orange wire connected to the battery?
In stock form they both [yellow (now red) and black orange] run to this plastic post on the inner fender, that is unused at the moment (if I remember correctly).
There are also connections inside the loom from this yellow and black orange cable. So this both cables feed all your electrical consumers.
There should be an additional wire from the alternator to the regulator, to get the "unregulated" electricity to the regulator.
If there is something with your wiring wrong (broken wire) than an alternator upgrade will not solve your problem!
you need at least voltage at the lightgreen-red cable at the regulator from the ignition switch (when ignition is on).
I would check with a multimeter if the wire from alternator to the regulator has a connection