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A battery cut off switch to actively disconnect the battery when the vehicle is operating has different requirements. It's not as easy as inserting an inline switch in a battery cable. The alternator must have a load circuit to send output, otherwise it'll burn itself out. The battery connection from the alternator is the normal load circuit. Disconnect either battery cable and there is nada load circuit.
A proper safety cutoff switch includes terminals for the main battery connection as well as a circuit to simultaneously open the alternator circuit and close a "dump" circuit to ground when the cutoff switch swings to OFF.
Sherwood
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