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Sea Ray
 BoatUS Boat Groups/Manufacturer Forums>>Sea Ray
Subject Topic: Batteries Does it matter? Post ReplyPost New Topic
 
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Tonymoree
"Seaman Recruit"




Joined: July 06 2008
Posts: 4
Posted: July 13 2008 at 12:47 | IP Logged Quote Tonymoree

I have an inboard outboard merc, closed system. It does not have an alternator. My friend and I were told we should not run marine batteries because it could burn out the (I forgot what he called it ) charging mechinism. We were told to use a car battery? Any Thoughts on that anyone?

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Tony Moree
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Rock Hall
"Seaman Recruit"




Joined: February 18 2006
Posts: 16
Posted: July 13 2008 at 20:53 | IP Logged Quote Rock Hall

Tony,

I'm a little confused. An I/O Mercruiser should have an alternator. The engine needs a battery to run and if it didnt have an alternator to charge the battery, it wouldnt run long. The alternator is what produces the current to charge the battery. It's really a generator that along with a voltage regulator produces around 14v to charge a 12v system.

Do you know anymore information on this?

 

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Equinox
"Seaman Recruit"




Joined: December 16 2005
Posts: 5
Posted: July 14 2008 at 14:58 | IP Logged Quote Equinox

Tony,

 

I think from your other post that you have the 4 cylinder mercruiser block.  The alternator is integral with the engine.  The stator and rotor is located behind the harmonic balancer.  The voltage regulator is located behind the exhaust manifold.  I have run marine batteries with no problem.

There are after market alternator kits to install an external alternator if yours fails.  The valtage regulator is expensive to repalce.  I think it was about $200 last time mine went.

This is not a typical marinzed automotive block.  You should get a shop manual.

 

Bob

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Rock Hall
"Seaman Recruit"




Joined: February 18 2006
Posts: 16
Posted: July 14 2008 at 16:08 | IP Logged Quote Rock Hall

Bob,

What years did they use this engine?

Iím interested in looking up some info on it.

Thanks

Mark

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Equinox
"Seaman Recruit"




Joined: December 16 2005
Posts: 5
Posted: July 14 2008 at 16:38 | IP Logged Quote Equinox

Mark,

I'm not sure of the exact years.  I think it was 1976-1989.  They had a change where they changed the materials in the exhuast manifold from iron to aluminum.  It is also known as 3.7 liter.  You may want to Google for history of the engine/block.

Bob

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