I tested on my ohm meter between the black wire on alternator and the black wire that hooks up with the red wire, both bypassing the bulkhead connector block, to the back of the Ammeter. Only 1.2 ohms on bypass black wire between alternator and ammeter. The dash harness black wire is still hooked to the ammeter also (both black wires on same ammeter post.
If your sketch is what you want to do, that will work if
the ammeter is good.
As Nacho wrote, remove the fusible link going nowhere. No need for a hot wire that is not terminated at something.
What I see in the photo as you found the wires is one with a ring terminal attached to the back of the ammeter. From what you wrote above, the wire from alternator power connects to the red from starter relay. What you call 'dash harness' we are assuming is a heavy wire to the main junction. (This is usually a welded splice). Attached is what I think the "as found" situation is.
Are you reinstalling the A/C? What year and model?
