67 Barracuda Heavy Electric Load

DallasMan2000 said

See pic below for the back side of the SPAL data sheet that includes the wiring diagram. I don’t think that the amperage goes through the firewall. Just the orange wire that signals the fan that the ignition is in the on position. I followed each of the wires and it looks to be wired exactly like the diagram.

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If the output of the alternator goes through the bulkhead and ammeter circuit, you still have the problem. When the car is running, EVERYTHING is pretty much powered by the alternator, not the battery. You must determine what mods have been made, what wiring upgrades have been made, etc

IF the ammeter is still an ammeter and not a voltmeter conversion, if it is factory, and if the alternator output goes through the bulkhead, you must change that to move forward. MUST