Plugged into shore power you should have 120V AC power to trailer....
With 120V AC power you should have 12V DC power via the 'converter'
No 120V AC power than battery should supply 12V DC power
You need 12V DC power for fridge controls
As suggested check on trailer tongue for a small box that has battery positive cable going to it and cable from it going inside trailer.
That is a DC Circuit breaker. Some are auto reset and many are manually reset.
Look for small button on side to reset
Also need to check that you installed battery cables corrctly and not reversed.
Reversed polarity happens a lot when batteries are replaced. Battery cables are not standard colors.......can be black & white, can be red & green can combination----so trace battery cable to frame--that is n=ground/negative on battery.
If connected backwards then 'reverse polarity' fuse(s) on converter are probably blown (30A or 40A fuses---can be on back or front of converter)
With the shore power plugged in........
Check main AC power panel
Main circuit breaker closed...all individual circuit breakers closed and see if converter is in a circuit breaker OR if it has a cord that needs plugged into an outlet.
Then check ALL DC fuses in DC dist panel.......usually with main ac panel
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31