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I recently bought a 1951 M38 that I am planning on restoring and noticed it has the auxilliary power plug on the firewall. For what was that plug used? I recently joined and am amazed at all the good information.

It was a factory installed non-accessory specific plug. Any accessory with the correct mating plug would work with it such as powered timing light or trouble light. It was discontinued with serial number MC47771.