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I bet he means that he charges the trolling batteries as they would not be hooked up to the alternator on the engine. Having two trolling batteries is great and having two batteries for cranking and pumps is also smart..4 batteries is really good for a serious flats/fishing boat with live wells and heavy trolling duties.
Honestley, a small Charles Marine 15 amp charger will work fine and is pretty cheap... but the real question is where are you going to get power from to run the charger and how often do you use the boat. Is the boat trailered or left in the water at the dock?
The advice on the Twelve Volt Bible is spot on. I had it and I know more about boat electronics than I ever though I would.
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1986 3.2 Carrera
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