Thanks ninti, loren!

as to How come you used the plug in power supply rather than the power and ground wires on the sled connector itself?

Well, for one the ISO connectore for that sled got buried in a heap of books and dirty laundy and I lost patience looking for it. Also, I had the impression that this would be the way to keep the "home" personailty/settings, although it occurs to me that having the plug inserted (whether powered or not) could be good enough for that purpose. Finally, I said "Why not? -- I couldn't see a downside except that I don't have a constant + on the orange wire.

Is there is a downside that you can think of? I'd rewire it in a heartbeat!

(Oh, and in my earlier post where I said I had a DB-9 gender changer on the back of the box? Well, that was true as I had a a string of short mismatched serial cables in there, but I cleaned it up with a nice long cat5 with RJ-45/DB9 adapters, so now the F DB-9 connector on the sled is just anchored through the back panel)