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Batteries not holding charge

dollie_blue

New member
"I will try to be brief...twin

"I will try to be brief...twin v8 volvo penta inboard engines (approx 25 yrs old) 1 - starter battery (new) 1 - house deep cycle (6 yrs old).
When plugged into shore power, through onboard charger, both engines will start no problem. If engines are shut off and shore power is unplugged even for a short time, as little as 10 minutes, port engine will start but starboard will only start once port engine is running and idle rpm is increased. Starboard engine will not start on it's own..makes noise like starter is malfunctioning. Further, if engines are shutoff for a longer time, 30 minutes or more, all battery voltage is lost, batteries are dead, neither engine will start without a boost. While engines are running all systems are normal including electronics. Help??"
 
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