I hope, by trickle charger, you mean an intelligent three-stage charger. A 2/10 amp car battery charger will do a pretty good job of frying a deep cycle battery if you're not careful.
The alternator may read as high as 15 volts... depending on the RPM of the engine, the charge level on the battery and whether it is internally or externally regulated. Anything above 14.7 or so is going to boil off electrolyte in the battery if used for an extended period of time. As HS has said, it should read about 14.4-14.6 Volts at cruising speeds.
Originally Posted by northstarjim
Thanks guys - I figured as much. Next winter -what should I do? I have both a trickle charger and a regular battery charger - should I just use the regular 10A charger every couple of weeks or so? or keep the trickle charger attached for longer periods?
Also - how exactly do I check the alternator output? Attach the positive lead at the positive terminal of the alternator and the negative to the other/ground terminal? I assume it should read aroung 13 volts?
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a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
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—Cpt. Mal Reynolds, Serenity (edited)
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