What's the cleanest way to wire a cut off switch

805moparkid said

cut the VR feed wire in half (from un-resisted side of ballast resistor)

the bulkhead side will be routed to one of the small posts of the switch

from the switch run another wire and connect to the other half..

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Disagree

I DO agree you SHOULD get a 4 post switch (properly known as a DPST, which means "Double Pole Single Throw)

I DISAGREE not to run a relay. The VR wire is the voltage sense wire as well as the power supply to the VR. A long run of wire all the way from the VR, back to the switch, and back to the original ignition buss introduces voltage drop and will cause an overvoltage / overcharge condition.

Using a relay (or continuous duty solenoid) up front to supply switched ignition loads, including the VR supply, removes this problem,