Wiring upgrades and ammeter operation

Amp Meter Bypass means means you actually Bypass and do not use the Amp Meter at all. In your case you are still running power through it. Easy way to bypass it is to put both wires on 1 Lug. You can then run your Alt wire to the Starter Relay, Starter or straight to the battery, your choice.

If you are upgrading to 100 amp alternator. You need a minimum of 8ga wire running from the Alt to your choice of landing spot.

I am installing a 100amp Alt today on my Scamp. I have a battery cut off switch on mine so it is a little different. I have my Alt wire going all the way to my trunk "Trunk mounted Batt" to a Ford Relay that triggers power from the Main Batt Cut off to the ignition which triggers the Relay to Close allowing power to feed the battery. Cut the Battery Disconnect and all power from the system and the engine kills. All power is stuck in the trunk with none going forward toward the engine or the dash. So mine may be a little different than yours.