Converter operational check
Measure and note coach battery voltage at battery posts with rotary disconnect switch OFF. You have to know its voltage so you can distinguish between it and any voltage from the converter along the way.
Refer to annotated photo to check converter operation. Make sure that shore power is HOT and all 120 VAC breakers are ON.
You should measure converter output voltage (12-14 volts DC) at both of the two lower terminals using the uppermost one as the ground for your negative meter lead.
1. If you do not have the correct voltage the "From converter" terminal, the converter is not working.
2. If you have the correct voltage on the "From Converter" terminal but not on the Out to coach battery terminal, the 40A fuses have been blown.
3. If both readings are correct, the converter is working and the problem is "Downstream"
4. Check Rotary disconnect switch is ON. Verify full converter voltage is passing through it. If so, go to #5.
5. Check for full converter voltage on both terminals for the 70A breaker (referenced to ground).
If you still need assistance, report all of the above readings and I can analyze and advise.