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Old 06-12-2020, 02:37 PM   #1
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Default Newbie Maxum 3300 Electrical Questions

I just purchased a 2003 Maxum 3300 Twin 6.2 MPI with Generator. I am coming up from a cuddy cabin so I many questions.

First, Batteries- I have Port switch 1-2-Both-Off, Starboard 1-2-Both-Off. I am confused on the house battery. Are 1&2 both start batteries & the generator battery the "house battery"? Also I assume I should keep the battery switches to each engine (ie port batt 1 & Star batt 2) not always to both. Broker said always leave to both.

Second, Generator- Does the Generator Power the Shore 2 side of circuit breaker Panel? I assume the generator powers shore 2 then if the engines are not running I can use the parallel switch on the shore 2 side of Circuit breaker panel to link the 1&2 to power everything. I also assume that if engines are running & I start the generator just don't use parallel switch. That way engines do shore 1 side & generator does Shore 2 side.

Third, Battery charger- I turn on the Shore 1 & battery charger to keep batteries charged at the dock. When I run the engines I turn off the Shore 1, battery charger and turn on the ship power. Is this correct to not have on the battery charger when I am under engine power. I assume so because the alternators are now charging the batteries. Plus I thought i saw that the charger on while engines running could damage stuff.

Thanks for all your help!!
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Old 06-12-2020, 04:08 PM   #2
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Nice boat.

Not sure but typically bank 2 of the batteries will start engine 2 and provide house power.

The generator will provide 110VAC and depending on parallel switch position will power shore 1 or 2 or both.

The engines can only provide 12VDC so no shore power from them.

Shore 1 will provide power to all 110VAC items when their breakers are on except the air conditioning with is the only thing on shore 2.

When the battery charger is on it should charge both banks of batteries.
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Old 06-12-2020, 06:34 PM   #3
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Mike in regards to the battery charger do I need to turn it off when I run the engines?
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Old 06-12-2020, 06:52 PM   #4
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Quote:
Originally Posted by billybatts299 View Post
Mike in regards to the battery charger do I need to turn it off when I run the engines?
You should turn it off before disconnecting shore power.
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Old 06-15-2020, 01:32 PM   #5
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Ok so I tested the Batteries and one failed. So I replaced both batteries and the generator battery is fine. What confuses me is both engines will start in the battery switch in the #1 & Both position but neither will start in the #2 position. In fact when trying to start batteries in #2 position the engines don't even try, no noise at all.
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Old 06-15-2020, 02:51 PM   #6
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Under Documents of this site you will find the year 2000 manual for the 3300 and on page 53 it shows how the battery switch’s are wired. Looks like position 2 jumps port and starboard battery to the other switch.
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