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David, connect the disconnect swith between the battery + side, if positive ground, and the frame. Connect the second ground from the where the first ground is bolted to the frame to the transmission.
There are several places to mount the switch. Mount it so it is convenient to you. I mounted mine in my Town Sedan just in front of the front seat.
I have a third smaller gauge wire running rom the frame to the headlight bar, just to ensure I have a good ground for the Headlights/turnsignals.