When ordered service and unit repair manuals for the 93 K1500, I also got the Electric Diagram on s and Diagnosis manual. It's an 11" x 17" spiral bound. I've gotten more years when I find them. This is way cool if doing electrical. Full complete wiring diagrams, locations, electrical parts numbers for connectors, relays. Here are some photos from the manual.
Check out how complete the radio diagram is. They all are very complete.
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