I'm helping a local guy with his latest project. He bought a rusted out 97 12v with good frame and he put a 69 gmc 1 ton cab on it. I need to apply power to the pcm so the transmission and charging system work properly. I was hoping someone could tell me which pin is power and which is ground! Thanks in advance

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bump- got the pcm all hooked back up and ready to run, but now I need to know what I will need from the wiring harness connected to the power distribution box if anything. never worked on a conversion like this before