Open your trailer Main Power Panel.....typically dark brown/black panel under fridge, cabinet etc.
Inside will be your Circuit Breakers for the 120V AC System and FUSES for the DC Dist System
Check that ALL circuit breakers are ON (turn them off and back on....looking at them can be deceiving)
AC Circuit breakers feed A/C Unit, Microwave, water heater electric heater element, outlets and converter (or converter could be plugged into an outlet)
Converter is what changes AC Power to DC power....supplies the FUSED DC circuits and recharges battery when you are on AC Shore Power. Battery supplies the DC System when not plugged into AC Shore Power.
Converter will take 120V AC and provide a 13.2V DC output (minimum) if less than that converter is failing/failed.
Check that converter is getting AC Power..plugged into a working outlet (if it has a regular power cord) or that the circuit breaker is ON.
(If converter is working it gets hot and the cooling fan in panel will run)
IF you have NO DC when just on a good battery then battery in-line fuse is blown (or a dc circuit breaker is tripped-----looks like a small box with 2 studs). On a travel trailer look under tongue a-frame---trace battery positive cable back to trailer.
If you have a voltmeter.use it to check for AC power/DC power for converter
If you don't have one.get one and learn to use. It really makes finding electrical issues easier on a trailer
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