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I have twin Cummins 450s 6cta 8.3 on a large boat. My batteries where bubbling out of the vents. 8d x 7. I have an inverter bank of two, house bank of two, one for each engine and one for my thruster. To start my alternator was swinging every few seconds from 14.7v to 12.7v I changed all my batteries and disconnected the heater for that engine. The swim stopped now it’s just charging. The batteries should be charged my inverter ran all night before I tried it I ran for about 10 minutes it continuously charged at 14.7v. It was isolated to only charge one 8d. I started the other engine it stayed at 12.7. My engines start immediately.
I’m not sure where to go from here. Would an alternator go bad an continuously charge. Is the rectifier inside the alternator. Is it as simple as checking diodes an changing them.
Thank you ahead of time. I spoke with Corey and he help me to get heater disconnected.
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