Per the 42% instructions, the sequence is battery, switch, Opto kill. From the Opto kill it goes to ignition and RX. Now, how are you powering the RX with that same battery and single switch? Does the battery have two power leads? Does the switch have 2 input / output leads? Or are you simple using the 42% Opto as you power source to the RX? Not trying to be a smart @$$, just trying to piece the puzzle together. And yes your drawing was good, but it didnt solve the mystery for me.

Thanks