Wiring upgrades and ammeter operation

Map63Vette said

there are three or four systems that draw their power from the black side of the ammeter. Disconnecting it disconnects all those other systems, so you have to supply them power somehow.

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All in-cabin loads come off the black "ALT" terminal of the ammeter. The red "BATT" wire goes direct to the battery, untouched by any loads except: transient under-hood (horn) and special high-amp accessories (spotlight, convertible top). That is so the ammeter reads all current flow in & out of the battery (what you want). Thus, the ammeter shows battery charging or discharging, not the current output of the alternator.

Don't disconnect the ammeter leads. If one touches ground - welding torch in cabin. You can leave them in-place, so black is powered thru the ammeter, or connect both on one terminal (better, more solid connection).