75 amp 2G alternator wiring???

i have a 75 amp 2G alternator. My fuse box says that i can hook all of its output wires to the fuse panel via the 12gauge "Alt Power" wire as long as the alternator is below 80 amps. I think this hookup would look like the b\w schematic attached.

However, i found the attached color diagram for wiring the 2G alternator to the starter solenoid.

i guess i don't know how a charging system works but...
1) how does the b\w schematic charge the battery? Does it run backwards through the fuse box and back to the battery terminal on the starter solenoid connection via the "solenoid power" wire?

2) If it does, will the 10 gauge "solenoid power" wire handle that with a 30 amp maxi fuse? I read on the hamb that the the maxi fuse should be 30 amps with a 10 gauge wire. Should the maxi fuse be 80amps? the harness kit came with a fusible link so i'm switching it out.

3) should i not hook up the "Alt Power" wire at all (see the colored diagram) and place a 100amp mega fuse between the alternator and the battery terminal on the starter solenoid?

I've looked at too many schematics and read too much.

Any explanation or advise would relieve the headache i now have.

Thanks,
Bryan

 

I would say the 2G is junk. The main current carrying wires plug into the Alt, not bolt on. Sooner or later they wobble, arc, and start a fire. Ford procedure was to cut off the plug each time!
A small 90A 3G would bolt right in the same space.

But if you gotta... The 2 brown wires carry the current. Y/W is a voltage sensing wire to see if the battery is charged. LG/R is the turn on/off wire hooked into the key. If you want a fuse I think it's supposed to be 15% bigger than the max output.

They misspelled 'battrery'.