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ContinuousWave: Small Boat Electrical
Re-fitting Sterndrive with New Alternator
|Author||Topic: Re-fitting Sterndrive with New Alternator|
posted 08-25-2008 07:56 AM ET (US)
Just rebuilt an older [sterndrive that used an ALPHA I gear case]. It appears the [battery charging] is not working. I proposed to put an alternator on the engine, but my electrician says that it could not be mounted in such a way that the pulleys would line up. Any experience with mounting an alternator would be appeciated. Also, if this is not possible, what are the [difficulties] with repair the [of the battery charging circuit]? I just put the engine back in after removal for rebuild. I see how badly located the stator housing and stator are. Hope I don't have to take it out again if a stator replacement is required.
posted 08-25-2008 08:18 AM ET (US)
It sounds like you have the infamous aluminum 470-488 series MerCruiser inline 4-banger that used the cast iron Ford cylinder head. Here is the company that makes an alternator conversion for it
posted 08-25-2008 10:59 AM ET (US)
It sounds like your inboard engine used a permanent-magnet alternator. The link given above looks like a good replacement option.
posted 09-01-2008 09:52 AM ET (US)
Dear Seahorse and JimH,
Thanks for the reply. What is "infamous" about this engine?
posted 09-01-2008 10:44 AM ET (US)
Dear Seahorse or JimH,
I have downloaded the manual for the wagner DC-60 alternator.
Before I get inot doing this, a further question arises. Could it just be that the voltage regulator is bad, and not the stator. IS this plausible, and if so, how does one check for this condition?
If it proves to be a bad stator, is there any other workaround for this problem than the Wagner alternator? I suppose I could always buy a new stator. Is this a good idea, or is going to the alternator the preferred method for a problem such as mine?
posted 09-01-2008 11:00 AM ET (US)
Your best bet is to have a trained professional check out the system if you lack the service manual and the tools needed.
It is common in some installations to have to remove the motor to work on the stator. You can blame the boatbuilder for that.
Call your Merc dealer and ask how much the regulator costs first.
posted 09-01-2008 04:42 PM ET (US)
Thank you. I have a local marine electronics guy coming tomorrow, we have the manual, so can proceed as you suggest.
I am trying to get out ahead of the job so I know what questions to ask.
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