John-
In the electrical cabinet in the toilet room of our coach, an '06 Monterey, along with the breaker boxes and multiplex fuses is a 4" square black 12v. fuse box. Pull hard on the tab at its bottom and the cover will come off revealing a couple rows of fuses. On ours is a refrigerator panel fuse, 10 amp, in position #2. If it's blown, fine you can replace it, but you have to wonder why it blew.
Many Norcolds were in recalls the past few years, and some that were recalled had to be recalled again to fix the fix. Some involved an over temperature module failure. Ours is a Dometic, so I can't speak to the exact issues or Norcold models involved, but you might want to check into it if you haven't already.
Joel