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Initially and if completely / electrically dead, then proposed preliminary check would be on the fusible link(s). These fusible links are inline with the wire(s) from a big terminal of the start solenoid that is tied to the battery's + terminals (in most versions). Scrape clean the connections or even bypass for test purposes.
If not corrective, then trace all the red wires and ensure the presence and consistency BAT+12 from end-to-end.