To the small ground on isolator. This will cut the ground when not powered and make the isolator kick out blue light off. Again this isn’t necessary the light will go off on its own but if it’s bothering you this will make it key on only.Al
Still being dense I guess. Red and black, got it. Either green to back of dual meter. Got it. But how does the other green “make the isolater go on and off?” Where would that green go?