wiring harness help needed please

I am doing a complete rewire on my 71 with a new harness from year one. The trouble I am having is with the blue ignition wires. The diagram shows a main black wire coming off my alternator, a green one with a push on plug and a blue one with a push on plug. This matches my wires perfectly except I have a 69 383 in the car and it only has a spot for the black wire on the alternator and only one push on tang which was used for the green wire on the previos harness, where does the blue one hook up??
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