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The diode idea didnt work I just tried it. And a solenoid wont either do to it needing a power loss to kick it off and nothing losses power with the alt powering it. I guess I will just run the alt wire and msd directly to the bat itself. I do like the idea of fuses on both sides of the alt line. And for what it's worth I tried the msd on the back of the alt and with the new box it didn't die either. Maybe because it's digital and not analog like the old box. I don't know why with the old box it would kill the car.

the diode will only flow power one way.turn it around and see if that will do it.if its wired the wrong way it wont work.