Well...I'm not sure. We are now going to get into the specific differences between a 92 imperial and a 95 Dynasty. On mine there are two ground terminal bars behind the dash high up on the firewall on the left side. There are probably, I guess, 20 ground wires going to them so it's lots, not just a few.
The green wire... again, sorry can't help you with that one other than to say it must come from a 12V source somewhere. Perhaps another fuse panel or perhaps directly from the battery. You could do what I did when I ran into this problem for the first time, I bought one of these Gardner Bender GET-4110K Ener Wire Tone Tracer
Mine has helped me lots when trying to find out "where the heck does THAT wires go".
Hopefully there is someone else here with, or has owned, the same coach as yours that has a wiring diagram or know where that power feeds from.