Posts: 433
Location: Cedarburg, Wisconsin | If the lights are on supposedly showing you have a good working condition when plugged in, I'd think the electronics inside the charger on that bank are probably defective. The charger must have some kind of monitoring system to check output and if this system is detecting a normal condition when there is no charging going on to a worn down battery, I doubt if it could be an inline fuse to the starting battery from the charger. That hopefully would show up as an open and register as a fault condition.
Another possibility might be a horrible connection, one that is severely corroded or a crimp that is sloppy loose going to the starting battery. I always figure it is easiest to start with the connections and work from there.
Ground issue? Not likely, There would most likely be two wires running from the charger directly to the battery, not just one hot lead and the other to a common point on the hull.
If you are ambitious, and assuming your charger had a transformer with three secondaries, you could disconnect all the leads and put an ohm meter across each pair to check the transformer secondaries for similar resistance to see if they are all intact. If the primary had shorted windings, I'd think they all would be defective.
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