So, I go out to do my weekly crank and run a bit and although 24 volt battery tender shows full charged batteries, it won't turn over and just makes clicking sounds. So I take rear battery loose and hook up fast 12 Volt charger and in 2 min, fully charged, then repeat process to unconnected other battery bang 2 min fully charged.
Then connect all backup and try cranking again, same think just clicks, wtf could this be, I'm not diesel savy, and handicapped to boot, anyone with suggestions, its appreciated, no mechanics in my area know squat.