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The driver circuit is controlling the ground/ trigger side of the coil.


Correct - through the VB921 driver circuit.

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This circuit is closed when no power is applied from the processor, If the coil were to receive power it will be grounded through the driver inducing a high current flow.


Maybe I'm not following this, or there's something I don't understand. If the MS "+12v switched" wire, the coil and the distributor sensor are all powered from the key switch, then when the key switch is OFF, how would the coil receive power?

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum