Stop in for a cup of coffee

Dave pretty much covered it.
Lets be sure you got it.
Go back to my mark up of MAD's diagram 'B'.
Trace your finger over the purple arrows from the alternator to the main junction.
How many connections?
Did the wire size drop from 12 gage or 10 gage to a smaller wires along the way?


Again. How did your finger cross the ammeter while following the wire from the alternator to the main splice?
Lets do one scenario at a time.
7.

Dropped to 14 &16

Not sure what the red wire is doing

No sign of ammeter hooked in to the mad B?