Well crap, I traced the ground from the negative battery post to the eyelet/body ground to a harness connection to two wires labeled as ground to the PCM.
Also along the way traced another spliced ground from the above wire to another harness connector to a diagnostic connector and to the PCM.
All these tested to be fine.
Another PCM is on order. It's really gonna piss me off if it cranks up and runs fine after replacing it.
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'75 Cuddy with '00 Johnson Ocean Pro 150 horse
Benny
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