Quote:

Because the alternator would still be powering the circuits if the switch was off.



I just went through this with my own car, I went through every possible wiring scheme to get around running wire back to battery. Only alternator this works with is the internal IR denso. Even if you kill the field wire (+ source to alternator) the alternator has to see a battery to cause it to "un" excite. Killing just the ignition is a way to get around the running wire to the trunk but BUT... its is said to be very hard on the alternator.

1973 Charger, former SE, former auto

I'm not trying to be difficult, it comes naturally....