battery maintainer

The dreaded crank but no start, with good starter rpm spin but no usual audible “click” from electrical components. Although the battery has been on a Ctek smart charger showing fully charged, I still reverted to a Noco jump pack first to just to rule out a good 12v indication but insufficient...

Good morning. Our 1960 Case 430 diesel has two 6v batteries, apparently it is 6v running 12v starting. It lives out in a shed on a lot with no power. I would like to keep the batteries up, but am unsure how to go about it. I use the little 1.5 watt solar maintainers from Horrible Fright on...