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The mag plate is well grounded. I’ve checked that a bunch. I get zero ohms from between any two metal surfaces anywhere on this engine.
This didn’t just start happening; it’s been this way (couple of years) ever since I “built” this engine (it was pieces & parts from 3 carcass engines). At first I thought it might be in the wiring from the engine to the dashboard (via a Deutsch connector), but in a “bucket run” I did it locally with a temporary switch on the engine. Same result.
I’m going to re-configure with a double pole switch per my proposed schematic above…as I said, “belts & suspenders”. Still, it’s hard to come to grips with why this is happening when wired in a “stock” configuration. It just doesn’t make a lot of sense (to me, at least).
FWIW (if anything): I may not be an outboard engine expert, but I’m an EE with 40+ years of power & control circuitry knowledge under my belt. Engine schematics & this circuit in particular are not complex to me…which is why I’m perplexed. That said, if I’m missing something, I’m open to all suggestions.