I have a universal 25 MXP engine
12 Volt - 50 amps PN 41017
when I leave the docks, after an AC charge the voltmeter reads just under 14. After motoring awhile the voltmeter gauge at the binnacle drifts down to as low as 13.25. This is new. They used to stay up around 14 when I was motoring. I was not at anchor
at all. just on the dock
Is this most likely corrosion
Old Batteries? (they are almost 5 years old)
Is the reading at the binnacle of the voltmeter at the binnacle gauge a combination of the batteries and the alternator
or just one or the other?
When I get back to the dock
the batteries are at 12. 91... and then go higher after an AC charge.
is from 2010 as is the alternator.
The belt is tight.
The voltmeter at the DC panel in the boat reads just under 14. Does this indicate corrosion
at the binnacle?
Should the batteries read higher after motoring?
Thanks for your thoughts,