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OK, so likely not battery with two there. Just for you though, NEVER think that just because the battery is new and charges up that it is good, it SHOULD be, but I cannot tell you how many times I saw a week old or less brand new battery seem to charge up fine and hold the charge as well, but spit its' guts out instantly at putting a starter load on it, and why an actual loadtest itself becomes the only true test you have of a good battery. I've seen a 12.8 battery drop to 2 volts instantly as soon as activation heat makes a cell-to-cell connection open up. As soon as it cools off the 12.8 is back and it will check with a meter at that forever. It just won't work under a heavy load. Batteries can fail in so many different ways you can't keep up with them all.
It sounds like to me that car is riddled with possible electrical issues.
Last edited by amc49; 11-28-2018 at 10:38 PM.