specifically you can go right down the line with a dmm till you find it/ isolate it. My guess is it is low enough to not really requirer a high amp ampmeter.Personally this more or less sounds like a show/summer vehicle and it would be VERY easy for you to install small maintaining chargers on each cell. In any case I still would talk to Kinetik to see what they say.
My vehicle sat outside for all winter no starting for 3 months nothing disconnected and it still started fine, and it has a kinetik. IIRC still read over 12.8v. Something in your car drained your batteries from what I can tell.
Does your truck have the same stuff hooked up to it? If you went to the corvette forums and tried to say an optima lasts 2 years sitting under the hood you would be bludgened. What is all hooked up in the vehicle with issues?
I would contact Kinetik and find out. Usually if you leave your vehicle sit for extended periods of time it is recommended to have a maintainer on them or disconnect the batteries.
By the time you get 2 or three modules maybe more to run your car you would have the money to run a stock alt along with the higher voltage alt.That is by far the best way to do it.
Yup I know a guy who drove 45 miles a day round trip for a week on a kinetik with no alt. If I remember right he drove it more than 100 miles to get home after the alt belt went.