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Just an FYI, on 73 at least, not sure about 74, but guessing its pretty close, the AC wiring from the bulk head connector is part of two harnesses under the hood, the forward wiring harness(for lights, horn, etc) has the leads that go to the dryer and they connect into that harness near the bulk head connector, and the engine harness has the wire that runs to the fast idle solenoid and the AC compressor clutch, wires should be blue.