'fleet/taxi' wiring bypass diagram.

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Don't know what you are looking at. Ring terminals may be at the starter relay stud?

16ga MAY be fuse link?

Here's what I see on page 8-167. Based on this diagram a 6ga wire on the alt goes to a "terminal block" where it Ys off to:
1) direct 6ga wire to ammeter;
2) to a 16ga fuse link/10ga wire to bulkhead connector then a 12ga wire in the cabin.
Is that terminal block called out just a post terminal with those 3 wires on ring connectors bolted on to it or a 3 lugged bus?

The red wire from the starter relay to ammeter is labeled A1A-16R. The last 3 characters 16R indicate a 16ga red wire or am I reading that wrong.

Your first answer was one part of the puzzle: yes I need a 6ga wire. Thanks for the prompt reply, really helps.