Great News!  Glad to hear all is well.  I have seen this more than a few times and usually find this when the gfi will not reset, even when plugged into 120 shore power.  If you decide on another 12v battery be certain to run each one independent of the other.  Only run together if they are of the same age as your older one will run the newer one down and shorten the life of it if they are wired to run together.

I run mine separate from one another.  The oldest one was put into service in April 2011 - a 12v Interstate group size 24 deep cycle.  The newest one (just over 3 years old) is a beast, a Trojan T-1275, a heavy weight at 85 lbs. but puts out 160AH which is great for a boondocker who is offgrid a lot.  No solar or generator is utilized either.

Greetings SnL,

Hopefully you have: a voltmeter, or a multi-tester, or a friend who is an electrician who can chase these problems down.  First question I have is in regard to your batteries you state you have a pair of deep cycles, are they 6v or 12v and if 12v are they run together or independently of one another?

The fridge as you know needs 12v to run the mother board so if it is running on both battery and propane mode the only obvious issue I see here is either the plug is disconnected on the back side of the fridge, you don't have power at that outlet, or the 120v lines going from the plug to the motherboard on top of the Dometic has worked its way loose. Here is where you need to use your voltmeter, multi-tester, friend - test all your fuses - sometimes they may appear to be good to the eye but the voltmeter may show otherwise - one or a few may not show continuity across the contacts.  Next check to make sure you have power running to each of the fuses with your voltmeter - possibly a loose wire or two at the converter - open your bench seat that is above the converter and look for any obvious loose wires, ect. Also get under your 177 and look for any damage to the wiring, mice or rodents (squirrels) maybe got hungry and started feeding on a couple wires.  The other place to look for this kind of damage is under your sink on the slide, open your access panels (yes it is a mess of wires under there! - I have a 177 as well) and with a flashlight look for any damage to the wiring. Have not personally experienced any of these problems but this is where I would start.  Please report back with any findings and if nothing pans out we will progress from there.

We have owned our 177 since March 2011 and have had a lot of great experiences with it for the 45,000 plus miles traveled.  IMHO it is the best floor plan and easy to maneuver, verses all the 'bigger' ones out there going from the 179 up to the double axle models.