[Dead Parrot]

I think the non red wire in the two wire plug is normally connected either through the Gen/Alt light or a under dash resistor for a gauge panel. Either way, it provides the initial current to energize the alternator. Normally a no connect when the ignition is off. By replacing that wire with the resistor, it will likely draw current even with the ignition off.

BTW - In the picts, your main charging wire looks to be undersized. Especially if that alt is a higher current output unit. Might check if fusible links are installed.