Not a schematic but has wiring color code and the size is huge, easy to read. Has breakouts organized as they are laid out in the car. Details of the mult-pin connectors cavity by cavity.
Based on 914/6 but still useful for /4
Available from Restoration Design.
Doesn't replace a real schematic to understand circuit interactions or current flow. As previously referenced, that information can be obtained from Haynes, Factory Manuals, or the super link above.
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