I've said this before------I don't like this philosophy and I don't believe it actually meets NHRA rules, which has words to the effect "must kill all power."
The EASY way to get around this is to buy a FOUR terminal disconnect, made by Cole Hearsey and others. The correct term is "two pole" switch, and these have two large (disconnect) terminals, and two smaller terminals for a control circuit.
All you need to is ground one of the small terminals, and run just one no14 up front in addition to your main cable. Use this no 14 wire to ground the coil on one side of a quality relay or "continuous duty" solenoid, and they use your ignition switch to power the high side of the coil. The alternator output can now be hooked to the main cable up front, at starter relay, etc.
Use the contacts to break your ignition run circuit, and if you have an MSD, this might be even easier because of their switching method.
