Some cars use the "R" terminal, others don't. "F" bodies used the "R" terminal to provide full bat voltage to the ignition coil when starting. "A" bodies did not use the terminal, instead they had an ignition switch with a IGN2 circuit that did the same thing.
OEM wire color on the "R "term was yellow, it went from the "R" term up to the coil (+), same color was used on the "A" bodies xcept it came thru the firewall bulkhead connector.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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