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Most I know do what Cab says and run the alt output wire to the battery side of the cutout switch. Another option is like I did years ago on my bracket car and that was I put a toggle switch on one of the field wires and ran it inside the car so I could kill the charging system when I made a pass and you can also just kill the charging circuit when going thru tech with that toggle switch in the car so it dies when the kill (cutout) switch is turned off. It is alot less wire to run if you just tap into a field wire and run it in the car within the drivers reach on a toggle switch. I burned out a rotor on my bracket cars alt so thats one reason I would kill the charging system when making a pass. Ron

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Dont let the tech guy see you with a separate switch
set up like that... its a no no .. if you forgot and
had it on during a pass it wont kill the ignition
if needed and your knocked out
EDIT
I use to have a switch on the panel just to kill the
alt during a pass but I seen ZERO difference in et
or mph but that was with the output still on the
battery side of the switch... so when I rewired the
car I left that switch out of it