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This is the good one. Picture from Rapco's ebay listing. Oh and make sure you disconnect the batteries before you mate the connectors!

Hmm, do you have a selenium rectifier (in the grille) or one with discrete diodes? The selenium looks like a stack of sheet metal plates. They tend to fail due to age. Suggest you replace it with one of the newer types with diodes.

My regulator makes a very audible "clunk" when field power is applied. Is your regulator a simple box or does it have a cylindrical finned top? It's possible your system is shot.

According to DA Pamphlet 750-33, pin F needs to go hot +24 volts when the ignition switch is turned on.

Recall that the 100 amp system was a kit installed at depot level. The kit would have had an instruction sheet inside the crate. Nobody I know has a copy. Here is what changed with the 100 amp kit on a M38A1 to the best of my recollection: Ammeter is replaced with voltmeter. Ammeter wires...