Power inverter issue

1979Prowler wrote:
Hello all, I am new here and am armed with questions.
First I am not new to camping, but I am new to electrical on my camper. I have a 1979 Prowler 19E. It is a great sturdy trailer but when I was in Kentucky last summer I had several appliances going at once and then suddenly they stopped. (microwave, Fridge, a plug in box fan, my computer, and several lights. The trailer was plugged in.) I checked all the fuses and breakers and they are fine. It is only the plugs on the right hand side of the trailer. The plugs on the left still work.

I am wondering if I fried half of the inverter as it is 36 years old? It does make a electrical hum as all old electronics do. But not a buzzing like sparks jumping.
Or is something else wrong. What are your ideas?

Also the 12V system never really worked correctly. The lights were very dim, and if you ran the water pump they were non existent. Could that have been an early symptom? Thanks for the input. -Nick.

You have at least two 120v receptacle circuits and each has its own 120v breaker on the panel. One of those circuits doesn't work, the other does.

The converter, however primitive, operates from 120v and makes 12v from that. You converter's charger is not working. You might have a converter that works but the charger part does not. Either way, with no charger part, your batteries will run down as noted.

Your 120v to the converter might be gone along with that one receptacle's circuit's 120v or you might still have 120v to the converter, but no charger part working.

With your digital multimeter you can find out what 120v is working or not and where. and you can check for 12v amount at the battery posts to see if it is at converter value of 13.6v approx. or just 12.x (or less) from battery only.