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Some are integral with the load center and some are a stand alone unit. Get back to me with that make and model of your load center and I can give you more here. And I would have the batteries load tested to be sure that they are viable. It may be more in those or the cables than the converter. You can test the converter with a small digital multimeter. This should put out about 13.7 VDC at the batteries. Most places that sell batteries can load test them for you. Just be sure you mark the cables well or take a photo of the hookup as it is easy to get this wrong if you don't. All follow ups are included in our fee and there is no time limit.
What is the make and model of your load center where all the fuse and breakers are? Many are integral with that. I can tell you more once I know what you have.
Maybe you have an inverter/charger.........
If you have 4 house batteries you will have an inverter/charger in this.
The "Load Center" is where you find all the fuses and 120 VAC breakers in most coaches. Manuals are not always correct! The are very generic most of the time and fit a number of models.
An inverter/charger works the same way as a converter except it can take 12 VDC and turn it into 120 VAC. Do you have a 30 amp cord or a 50 amp cord?
Maybe that is where the problem is. And almost every RV with a 50 amp cord has an inverter/charger and they are usually right above or next to the house batteries. I would start by load testing the batteries here first. Rule that out and then go to the next step. Most places that sell batteries can load test them for you. Be sure and mark the cable or take a photo of the hookups as it is easy to get this wrong if you don't.
And test the output there and see if you have about 13.8 VDC at the batteries.
Then find out why with your meter. It isn't going to be the inverter if all else works fine. Either the thermostat is bad or the wiring coming to it is loose or has some corrosion issues. I have to go out so I will turn this over to another tech if one is available. They come and go daily so I don't know when that might be. I will be back on in the morning.
I was gone all day yesterday and I see nobody picked up on this. That may have been due to not having a different solution. What is the make and style of your thermostat? If a digital model it would be helpful to know exactly which one and attaching a photo would be helpful here. Use the paperclip icon.
Just following up to see if perhaps you missed my earlier response to your question? Easy to do considering the volume of e-mail that most of us get every day! If you need me to resend it please let know. Thanks!