Wire the coil power directly to the master switch, (no toggle).
But the alt power line must go to the "UP ( bat,side) for this to work.
I see that it is this way already.
I often use the second set of post to wire the ground for the fuel pump(Miata FI) This of course wont work for a carbed car. 3 secs is valid shutoff time.
The ignition system must be a flying magnet( square wave) style and generate a little voltage.
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