Painless Performance

I'm currently installing the dual battery system into a 1994 Jeep YJ.
As per the instructions, I need to find a power source that is hot in the "run" and "start" positions on the ignition switch for power to the toggle switch.
The instructions also say it is important that this source not have power in the "acc" position. As far as I can tell, I only have two positions on the ignition switch aside from the first one which unlocks the steering wheel. (no accesories work in this position.) Can you offer any specific advice on which wire to tap into ?

The yellow wire coming out of the ignition switch powers the coil. That would be a good wire to tap into.
Hope this helps
Dennis