If you are charging at 25 amp, that's a bit low, I would take of the batteries and have them bench charged, then checked for state. The battery testers now are far better than the old load test type, and you have removed one unkown.
If batteries are ok, then it's a matter of checking with your clamp meter for a large unknown current. Set up boat as it was overnight, and monitor battery current voltage fall with time during the day. To loose say 50% of the battery you must be drawing 10amp, so any fault should be obvious.
The big problem with charging is that they have been run down to 0 volt, so you may get surface charging.
All the best
Brian
-------------------- Kddpowercentre designers and purveyors of fine charging systems for 30 years.
Powercentre spares and help line
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