The AC portion of the harness inside the car is a separate piece. I replaced my main harness, had to buy the extra AC harness and plug that into the bulkhead.
They go through the bulkhead connector. Just hooked these up on my car.
AC harness should have the mating connection on the inside.
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Pretty sure that's not the correct 1 for 70.
Should only have 1 wire for power, and a bullet connector to plug into the female bullet hub that has 3 spots.
Ground is provided by the bulb socket to dash frame
They switched to a 2 wire connector on the later years.
Having typed all that, it will...