My surveyor noticed that the voltage of the house batteries were below 9 volts, not even enought juice the power the interior lights.
Got down to Mimico, and met the previous owner David.
The boat came with a 70A Balmar alternator with an external regulator and battery isolator. These and the house batteries came with the boat when he bought it in 2007.
I added about 1L of distilled water in each of the house batteries, hooked up the boat to yard power, and charged the batteries for about an hour. After turning the charger off, the voltage was up to 12.5 volts.
Time will tell, but I think the purchase of new house batteries may be in order for a piece of mind on an extended cruise.
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