On Mar 26, 12:48 pm, Mitch Mitch@... wrote:
Are you by chance not connecting the charger directly to the battery
terminals

I'm connecting the + to the battery's positive, and the - to a bolt
head on the engine block.

I'll try cleaning again.

Sounds like a bad ground.
Also a 6 year old battery is pushing the limit age-wise.I generally
use a battery 2-4 years here in the Midwest then if it's still good I
keep it charged and ready to back up the new one just in case.