C03 Why does the harness I just bought look slightly different than my original wiring diagram?
Don’t worry. Your new harness is correct. It is not uncommon, in fact it is very probable, that this is the case. Most schematics or wiring diagrams, including those found in the assembly manuals, are not 100% correct or up-to-date (and they usually reflect the wiring for a baseline car with no options). Schematics usually don’t reflect wiring changes, revisions, or additions due to optional equipment such as: gauges, consoles, automatic transmissions, big block engines etc. Unfortunately, GM never produced schematics for cars equipped with these options. Although most of the GM wiring diagrams are correct, and can be a valuable tool when troubleshooting an electrical problem, they do contain flaws; flaws in wire color, wire gauge, connector cavity, graphics, etc. This is usually because they do not reflect running production line changes (a change that may have been made on the production line but was not later corrected on the original wiring diagram), or later revisions. All our wir
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