first I feel your "pain"...when I first got my trailer...97BF17CB... the electrical
lay-out was very frustrating to me....the way it's done makes it virtually impossible to trace wires...everything is bundled up and fastened to the floor....then the rest of the trailer is built over all that "mess".....
a few points that might help:
when Dometic refers to "clean" power they mean power coming directly from the battery
(ies) ALL THE TIME ( not from converter,trailer plugged into shore power or not)
"clean" power is required/suggested for electronic appliances like televisions and radios because converter power can produce hum/noise in those appliances. Magnatec power centers include a certain number of "clean" power circuits. On mine there is three...located to the right side of the board...only one is currently used to power the 12V plug intended for a television (red wire in pic of fuse board)
in my trailer that circuit does NOT power the fridge....the wires that power the fridge are fairly big (it's a three way fridge and could be run solely on 12V when it came out of the factory)
BF uses quick connectors EXTENSIVELY in their wiring....as said before it's all hooked up and then bundled, fastened to the floor.
my trailer has a "main fuse" just as the wiring enters the trailer through the floor....in your case, if your trailer was plugged in it is conceivable that you would have power everywhere (from the converter) and not have power at the fridge if this fuse (barrel type, in a plastic holder) was blown....
in my trailer I am guessing / come to the conclusion that between this main fuse and the power center there is a quick connector somewhere on the wires....and that is how the fridge is then powered....
good luck to you.....by the time you figure this one out you'll be an "expert" on BF wiring.....LOL..."what doesn't kill ya will make you stronger"....cheers, F