Ok, before you get deep into this, read the thread I am linking here. I had the same identical issue with our '21 Pinnacle and interstate sealed batteries. I am presuming you have these as well If so, read on.
This was my post to this member on this thread
Join Date: May 2021
Originally Posted by cadman_ks View Post
Well, something else is going on.
Our '21 Pinnacle did the same thing last fall after having it for a little over a month. Here is my take on your issue. I had the same batteries as you. Dealer was not aware their shop had installed those in the camper. He said he had issues before with the sealed batteries not having enough water in them from the factory. My battery compartment got so hot you couldn't touch the metal shelf above. One of the batteries vented in the compartment, and a sharp- eyed member on this site noticed it. I have a thread on it somewhere. There was nothing wrong with the camper. Our dealer is 300+ miles away, so I took them off and had them tested at the nearest Interstate distributor almost 50 miles away. They tested fine, although still hot, and they commented on this fact, yet he would not replace them under warranty. he actually said if I replaced them with regular flooded units, they would resell these!! I bought regular flooded Interstate replacement batteries, and all has been well since. Dealer did reimburse me for the cost. I tested temps in the compartment as high as 195-200F. I am pretty sure this is your problem. Took me days to get this sorted out.
We also have solar installed, so that threw another wrench in the equation, but as I said, I highly doubt there is anything wrong with your electrical system, those Interstate sealed batteries are low on water from the factory. Our dealer said his local interstate Rep didn't like the sealed units either.
2021 Ram Laramie 3500 SRW Air ride 50Gal fuel tank.
2021 Jayco Pinnacle 36FBTS, Andersen Ultimate Hitch