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Does killing "All" power mean it kills the engine and it will not crank either? I can't think of a way to do it with a single set of contacts like most switches that I've seen. I've never put a lot of thought into it either.



The easy way to do it is to put the switch on the negative side of the bat. But evidently the tech guys at NHRA aren't smart enough to allow that logical solution so they insist on the switch being on the positive side. Having the switch on the positive side causes several issues with the charging circuit but NHRA refuses to open their mind.



that being said...whenever I was tech inspected at any NHRA event,they would have me start the car then they would turn off the switch making sure the engine and all electrical would shut off..I dont recall any of them checking the battery leads or source except whether or not the battery was in a box(no firewall needed) or open and if there was a cell(firewall needed)..

so..yes switching the negative is the best way..and easiest..but not allowed