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Automatic Battery Charger... So They Stop Once In A While?

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Old 11-25-2007, 03:32 PM
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Automatic Battery Charger... So They Stop Once In A While?

I have shore power with automatic battery charger. You probably know, as soon you hook the boat charger on 110 volts, you immediatly can hear a ''grrrrrrrrrrrr'' sound, just like with any big battery charger. There is a red light on.

I'm always wondering how is this thing really working. Each time I leave the batt charger on, either for 2 or 4 or 6 hours, I always hear the ''grrrrrrrrr'' sound, and the red light is always on...

So, I'm affraid to leave the Batt charger on and burn the batteries or even set the boat on fire with this thing. Is the battery charger light supposed to turn off sometimes if the batt are full? If ever it stops charging, would I still hear the ''grrrrrrr'' ? Or if the batt charger stops charging, then the ''grrrrrrr'' sound would also stop?

Any light on this subject would be appreciated!
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Old 11-25-2007, 03:35 PM
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What is the make of the charger?
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Old 11-25-2007, 06:58 PM
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Be Careful. They can raise hell!!

Last edited by Comanche3Six; 05-31-2009 at 05:54 PM.
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Old 11-25-2007, 08:37 PM
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What is the make of the charger?
I don't know or can't recall... Boat has a tarp on it right now with snow on it so ... will need some sun so I can look at it... But it is the factory charger Formula supplied in these years. The red light is on top of charger, not on the sides...
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Old 11-25-2007, 08:38 PM
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Be Careful. They can raise hell!!
That's why I'm asking before leaving it hooked for weeks...
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Old 11-25-2007, 09:27 PM
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Originally Posted by jeff32 View Post
I have shore power with automatic battery charger. You probably know, as soon you hook the boat charger on 110 volts, you immediatly can hear a ''grrrrrrrrrrrr'' sound, just like with any big battery charger. There is a red light on.

I'm always wondering how is this thing really working. Each time I leave the batt charger on, either for 2 or 4 or 6 hours, I always hear the ''grrrrrrrrr'' sound, and the red light is always on...

So, I'm affraid to leave the Batt charger on and burn the batteries or even set the boat on fire with this thing. Is the battery charger light supposed to turn off sometimes if the batt are full? If ever it stops charging, would I still hear the ''grrrrrrr'' ? Or if the batt charger stops charging, then the ''grrrrrrr'' sound would also stop?

Any light on this subject would be appreciated!
If its on your 89 year boat you might want to put one of those small,new battery tenders from a store like boaters world.
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Old 11-25-2007, 10:23 PM
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Ditto on the battery tender. Been using it for years on all my toys. Small enought to fit anywere and not powerfull enough to toast the boat.
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