I can't speak for how your plane is wired, but in the RV-12 the R and B terminals are both connected to the battery positive terminal. I don't know if that's the case in all installations or not; the RV-12 is the only one I've seen that uses the Rotax and the Ducati regulator.
I'm sure there is a wiring diagram for your Sky Arrow somewhere, that would tell you for sure. Also... burnt terminals like the ones in your picture are usually the result of loose connectors. You may want to gently crimp the female connectors, or replace them if they're too far gone. They need to be be tight on the spade lug.
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)