That I don't know. The M2 circuit yellow wires are from the dome light and are hot.
Here's corrected factory diagram for the accessory light package.
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Really what you want for assembly is the cable and cable routing diagrams. Some are in the shop manuals. '71 has more than most years.
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All cables are on the assembly drawings. I'm not sure if Faxon has published any assembly drawings for 1971 A-bodies. They have exclusive right to publish those.