I think I might have found all the info I need from this site,
Timely Topics -- Your Vigor's Charging System
It says the C wire is from the ecu and is the alternator charging control wire. Whereas the FR is the alternator charging rate and is an input TO the ECU.
It also says this"The voltage regulator puts approximately 8.5V (reference voltage) on the control wire, labeled "C" (WHT/GRN). When the ECU drops this signal to ground, the alternator will stop charging. If this wire is shorted to ground, the alternator will never charge."
Which makes a lot more sense to do if this works. 1 wire to switch and that's it. I hope the acuravigorclub is right, with the lengthy explanation I'd be willing to bet they are.