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  #21  
Old 07-04-2014, 09:07 PM
vipermeat vipermeat is offline
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Will a standard car alternator work on a marine engine?
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  #22  
Old 07-04-2014, 09:09 PM
vipermeat vipermeat is offline
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Those both do slow down the charge and at idle it is only pushing 11 volts
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  #23  
Old 07-04-2014, 09:11 PM
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Quote:
Originally Posted by vipermeat View Post
Will a standard car alternator work on a marine engine?
No. A marine alternator is screened to prevent sparks from making the boat go boom. If needed, you can take your alternator to a local shop for a rebuild, or talk with the guys at DB Electrical.

http://www.dbelectrical.com/c-3426-marine.aspx
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  #24  
Old 07-04-2014, 09:12 PM
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Quote:
Originally Posted by vipermeat View Post
Those both do slow down the charge and at idle it is only pushing 11 volts
sometimes these older alternators need to see 1200 RPM or so to excite the field to get the charge going. Sounds like you might have a tired alternator.
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  #25  
Old 07-04-2014, 11:36 PM
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Do you have a volt meter or amp meter in the dash? My 78 had amps. Before pulling the apt check the volts at the battery while running.
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  #26  
Old 07-04-2014, 11:39 PM
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Quote:
Originally Posted by vipermeat View Post
Will a standard car alternator work on a marine engine?

Work-yes. Safe- no. Marine alts are designed to not spark, therefore not ignite gas fumes in bilge. Do it right, get a marine alt. Same goes for starter.


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  #27  
Old 07-05-2014, 06:34 PM
vipermeat vipermeat is offline
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So, the alternator has 13.4 volts out. The battery gets to 12.6 with a good charge and then depletes throughout the day. My guess is the wiring but for now I just keep charge/ski/charge/ski.
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  #28  
Old 07-05-2014, 06:58 PM
Cloaked Cloaked is offline
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Quote:
Originally Posted by vipermeat View Post
So, the alternator has 13.4 volts out. The battery gets to 12.6 with a good charge and then depletes throughout the day. My guess is the wiring but for now I just keep charge/ski/charge/ski.
New battery should hold. You're getting close. Something is not recharging or something is not holding. When you say new battery, do you mean new store-bought or new-to-you?

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  #29  
Old 07-05-2014, 07:16 PM
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Quote:
Originally Posted by vipermeat View Post
So, the alternator has 13.4 volts out. The battery gets to 12.6 with a good charge and then depletes throughout the day. My guess is the wiring but for now I just keep charge/ski/charge/ski.
Do you have any accessories that could be drawing the battery down? Do you cruise for extended periods of time at idle?
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  #30  
Old 07-05-2014, 08:43 PM
vipermeat vipermeat is offline
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The only switches on the boat are the blower, bilge and lights. Any of those could be the culprit at this point but the bilge and blower work with the switch. Lights do not work and I have not investigated that yet. The battery is a week old from the MC dealer. They said they noticed the charge not getting to the battery when I had them check it out and we're going to fix it. If they did I do not see it but I am new to this thing. My brothers place is at the end of a half mile no wake area so there is a lot of time at idle but in gear.
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