House bank is new - replaced in June 2019 with three 155AH 12v sealed HTL batteries
connected in parallel. Start battery is a single
200AH sealed lead acid and was on the boat
when I bought it. Estimated age of start battery is 8 years.
should be in good condition.
When the issue began, the charge light would go off somewhere between 10 - 60 minutes after starting the engine. It has progressed and now the charge light sometimes remains on.
By "Common" I mean the positive side of the solar and wind generators connect to the shunt on output side of the Blue sea battery selector switch and the negative to the negative bar connected to the negative side of the batteries.
The house batteries (or one of them) failing very early has crossed my mind, but I have been reluctant to pull them out as they are difficult to get in and out of the battery box
they are in, and the fact that they are new. The alternator
was removed and thoroughly cleaned. The engine and alternator
have only done 700 hours.