Rum Runner
New Member
I have a 1987 340 Sundancer with three deep cell house batteries, run in a series. The batteries are charged by the original smart battery charger installed by Sea Ray. They show a charge of 12.6 volts when fully charged, but drain within an hour or so. I did not have this issue until I recently had the boat hauled and the bottom painted. When the boat was returned to the slip I discovered the problem. The batteries are about 18 months old. Any suggestions would be helpful.