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12 volt starter modification only requires, changing the starter, moving one battery cable(at the firewall) and removing the under dash relay and connecting 2 wires(out of the 4). I'm sure it can be done differently, but That's all I would do(haven't ever done a 12V conversion).

Look at the -20P TM. It clearly shows that both alternators are the same part number. Only the passenger side(alt 2) needs to be isolated ground. The military only stocked one alternator for logistical reasons. Therefore, in original configuration(as built by GM for the US government), both...