Whats everyone using for a battery disconnect switch on their mopar new and old?

Demonracer said

72bluNblu, that's the same way my race car is wired. I've used the same type on multiple cars with no problems over the years.

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Yup. Wired like that the disconnect kills everything, including the alternator if the car is running. With the disconnect thrown the only thing still hot is the line from the battery to the disconnect switch, so no power at all anywhere outside the trunk.

And many thanks again to @67Dart273, who walked me through the whole thing when I did it. I made up the diagram, but it was decidedly all of his electrical know-how.