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Originally Posted by Jerry Clayton
best way to do it as there isn't the high ampere load on the negative side--most of the switches on the market aren't rated high enough for continous duty on the high amp systems in most cars
And about half of the cars I've seen with the switch in the positive side will keep running with the switch in the off position--
Jerry
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There's an equal current draw on the negative lead, it is a complete circuit.
If your car keeps running when disconnecting the switched positive lead, it will still do it when disconnecting the negative lead for the same reason.
Having the exposed terminals on the switch at ground potential is a big advantage though if something metal contacts them and the surrounding grounded surfaces though (like the aluminum lined trunk compartment pictured).