There is the minimum to pass tech and safer methods. Have to choose your route.
When you see a 25K+ car burn to the ground from a hot alt wire AFTER the kill switch was thrown, it colors your opinion regarding the minimum standard. I always run a ford style starter solenoid and a CD relay (alt wire). From the left side of that plate, forward, NOTHING on my cars is hot when the kill switch is thrown.
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pick your parts, pay your money
