Originally Posted by lake15
i have a 1996 Rockwood Popup with a Magnetek 6600 series inverter.
When plugged into AC, the outlets are dead. Hwever, the pump and interior lights work.
The 15 amp breaker, when switched on, cause the inverter to hum gently. The 30 amp breaker seems dead as flicking it in either position does not produce a hum or 'on' vibrating sound.
Are my suspicions of a dead inverter correct?
12V items are powered by the battery, which is charged by the converter when the PUP is plugged into 120V AC. The 12V circuits will have fuses, not circuit breakers for protection.
The AC for the outlets goes through the converter directly to the circuit breakers. The "pass-through" AC side of a converter seldom fails (but the circuit breakers themselves might).
The 30 amp breaker is for one of the two things:
1) the input breaker for the AC coming into the camper. Think of it as the "main" breakers at the top of your house electrical panel. Or much more likely (since the breaker doesn't work but you can get a hum by throwing the 15 amp breaker)
2) the circuit breaker for the air conditioner - whether you have the air conditioner or not. The 30 amp breaker will NOT power your outlets separate from the converter.
Assuming that you are correct that there are only the 2 breakers, the 15 amp breaker supplies the converter and your outlets as well, which is why it hums when you turn it "on". In an ideal world the converter and outlets would be on separate breakers, but who knows in an older PUP.
In a PUP as old as yours, GFCI may or may not be present. If present, it is often on the outlet inside the refridgerator compartment (so your fridge can run on AC).
For testing, get the "hum" going. Check the voltage at the battery. If it reads 13 volts or better, the converter is working properly and charging the battery. And it also means you are getting AC into the camper to the converter. If the battery is at 12.6 volts or less, it is not being charged.
Next check the outlet in the external fridge compartment for 120 volts (you can use a known good night light). If it has GFCI, test then reset. Then check EVERY other outlet the same way. Failure at the outlets, but a good converter means you have an AC wiring issue.
Replacing the converter is not necessarily a bad thing even if it checks OK. The newer, better quality converters will do a better job of charging/maintaining your battery. But replacing the converter will not fix an AC wiring problem.
just my experiences