Got the p/w and p/l swap done and its a pita compared to others ive done. mainly pulling floor harness segment up through the firewall and the main connector for dome lights and such. But everything else was plug and play
Little bit of info if your harness comes from one with a factory amplifier and your not gonna use amp then you gotta bypass it for rear door speakers to work
amplifier connector its behind dash, right of the column
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Plug is numbered, looked up diagram and found what went where. I cut power and ground to different lengths and tied rest wires in and completely removed connector
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Now after all that. fought the harness a little getting it in plugged it all in that part was plug n play, added fuses, all the windows worked and the lock actuators tried but they are gonna need replaced.
And for the crappy part of the swap this connector is the only thing different which feeds the dome lights, lights for switches, and few other things that ill find out if i need when i get diagrams. but big connector to right is the new harness and the small plug is from the original harness
And for the record mine is a 99 c3500 and donor was a 99 suburban LT k1500
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Almost forgot another plus ill have keyless entry too once i order a fob