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Got the batteries hooked in parallel and charging, fingers crossed. Only had 1 set of jumpers handy so I used some wire I had on one set

Pulled the 2 bad batteries, the side label lists them as AGM, just like wes said. The tie over between the 2 may have been loose even though the clamps were tight, perhaps thats why this pair went bad.

Does it have to be a deep cycle battery? I have several regular batteries, I get the impression that a good battery will get the charger to activate whether its deep cycle or not.

Thanks for all the input I definitely appreciate the knowledge and experience. Since they are agm according to simp (thanks) ill try the parallel charging method.. I'll just run the 2 in the mean time and go back to 4 if they resurrect.

That's great news to hear, I'll have to educate myself on how to resurrect them, the repair function of the battery charger didn't do it.

5 ton Ill check the connections, the recent charging and testing has been with the batteries separately on 12v chargers.

Mine are maintenance free I don't think they're AGM, at least I didn't see it on the battery anywhere. I've had my genius 7200 set on 24 volt and had it maintaining the truck through the slave Port since I've owned it which has been a few years now

Thanks, but I like the singles, I'm not looking to go to duals in the back, but Dual 395 would look pretty badass! There's a water truck on Instagram called tactical Nessie that I follow that has them and it looks pretty tough

Thanks for the replies. I figured if the tires were getting too old I'd look for newer 395s. Mine look good, just the age was concerning me, for on road use anyway. What about running the 2 good military batteries for now, just removing the 2 bad ones?

it seems that two of my batteries have gone bad, I normally keep my truck on the Noco genius 24 volt charger through the slave port oh, I was putting it around on the property using it and I noticed once or twice when I hit the start switch it didn't crank and then when I hit it again a second...