jplante4 wrote:
Surprised no one mentioned the most common cause of batteries not charging - dirty terminals. Take all the wires off the terminals and clean them shiny bright with a wire brush or sandpaper (stay away from steel wool says the voice of experience). Put everything back together tightly and coat all terminals with some sort of grease that will prevent future corrosion.
Valid point. I assume you mean chalky or corroded connections. It is possible the former batteries were flooded and the cables need to be checked.
AGMs usually don't have dirty terminals, however connections should be checked annualy.
If an AGMs terminals are 'dirty', the battery is likely defective and needs to be professionally examined.
HTH;
John
