12v in RVs follows a similar color strategy as home wiring - black is hot (positive), white is neutral (or ground). A quick spark may not have blown anything. Hook it back up (correctly) and see what you've got.
I did the same thing this past weekend on my GF's motorcycle. It wouldn't start so I installed the battery out of my bike. Little did I know the terminals were backwards versus her battery. Got a big arc when I touched the positive terminal so I knew something was wrong. No fuses blew and once I got it hooked up properly it was fine.