67 Barracuda Heavy Electric Load

Well I finished my egg, this morning. I see that I forgot to mention "the easy way" to bypass the problem.

Crackedback sells a little kit

So what you do is this:

1...DISCONNECT battery ground!!!

2...Disconnect the bulkhead connector plug containing the large black/ large red ammeter wires and closely inspect the terminals in both halves of the connectors for damage. Repair that as necessary
3....Unbolt the ammeter terminals and either bolt both ammeter wires to one stud on the ammeter, or use a separate bolt to splice them, then tape. (Consider adding a voltmeter)

4....Install Crackedbacks bypass kit or make your own. You want BIG wire for a big alternator and oversized from there if it is a "one wire" unit. This goes direct from the alternator output stud to a good solid path to the battery +. Either the starter relay "big stud" (But only if the supply to the stud is also large enough) otherwise devise a terminal junction etc to tie into the battery. On an alternator that big you probably should be using at least no4 wire OR LARGER IT MUST BE circuit breaker or fused in that path, near the battery

HOW THIS works, basically

First, this removes all the charge current going to the battery from the wiring into/ out of the passenger compartment. The old red and black ammeter wires are not effectively in parallel (makes them larger) to become the feed into the car for those accessories.

The charge current obviously now goes direct from the alternator to the battery.

If your heavy loads are properly connected, they will not be going through the bulkhead at all. They will come off the alternator / battery under the hood

THEN if the charge voltage is still low, you/ we can address that.