Went fishing the other day and came back to dead batteries on my 6.7. When I charge them and run it, they stay at 14V while running, so I know the alternator is good. When I kill it and it sits for more than a few hours they drain to around 8.63V. One battery is 2 yrs old and the other is 3. Was hoping someone could tell me if that means that they are both bad or if just one is and it drains the other.
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