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Originally Posted by BlazerLT
Whta are you going to be powering with the second battery?
Also, in a boat application, there is usually a battery charger incorporated into the boat's electrical system which charges the battery up when you are hooked to 120v AC when you are docked at a powered parking spot.
We never idled the boat to charge ours up. 460 big block doesn't make for an economical battery charger if you catch my drift.
Our boat was a 30 foot Bayliner Avanti and it has one of those HUGE deep cycle batteries.
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Just to clarify....he's not using a second battery he was replying to me and you telling him that an alternator is not a battery charger. He wants to know why it is okay on boats and not okay for trucks.