Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[sender via CnC-List]

Dave:
Since you're getting low voltage between the batt terminal and the
alternator casing, it does sound irrefutable, it's kicking the bucket.

You can remove your alternator and take it to an auto-electric shop.  New
electronic module and bearings and you have a good as new rebuilt
alternator.  They're not as common as they used to be, but they specialize
in repairs and re-building starters and alternators.  If you know anyone
with the classic car bug, they would likely be able point you in the right
direction.  There are cheaper options from auto parts stores, but I'd
strongly recommend rebuilding it or replacing it with another Hitachi
alternator.

Eric

On Fri, Aug 9, 2019 at 1:41 PM Dave S via CnC-List 
wrote:

> Hi All,
>
> I have a yanmar 2GMf20 with what I believe is the stock 55 amp
> alternator.   I noticed that my ACR was not combining batteries, which led
> me to research a bit then measure the voltages on each bank, and then at
> the alternator “Batt” terminal.
>
> Irrespective or RPM or battery state, the voltage at the BATT terminal
> does not exceed 12.63 in operation.   (he ACR therefore doesn’t “see” a
> charging state)  The belt is new and not slipping.
>
> This suggests and alternator or regulator problem.   Does this make
> sense?  Is there anything else I should check?
>
> If I end up replacing the regulator, are there better options for this
> alternator than stock?
>
>
>
> Thanks All.
>
>
>
> Dave
>
>
>
>
>
>
>
> Sent from Mail  for
> Windows 10
>
>
> ___
>
> Thanks everyone for supporting this list with your contributions.  Each
> and every one is greatly appreciated.  If you want to support the list -
> use PayPal to send contribution --   https://www.paypal.me/stumurray
>
>
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Stus-List Hitachi 55A alternator question - 12.63 v output

[Francois Rivard via CnC-List]

Hi Russ,

I had alternator issues (Diodes)  I looked into having refurbed and found
it wasn't worth fooling with.  I found a shiny, brand new,  genuine Hitachi
(Yanmar's OEM) alternator for about $75.00- 80.00 shipped on eBay.  I just
put it in myself, it was a plug and play 30-45 minutes install.  At least
on my boat, it was one of the easiest  / most accessible things to
replace.  The new one worked much better than my old tired one when it was
working "correctly". That was 5 years ago.  Never had a problem since.

When you think about it, especially if it's the 30 some year old original,
the brushes are worn, the bearings are worn, the windings have seen better
days.. The whole thing is worn-out.  You'd have to replace pretty much
everything on the alternator. After some research, I found that buying a
shiny new one was cheaper than having my old one re-furbished locally.

Here's an actual Yanmar brand Item for $160.00 (Pretty good price for OEM)
:
https://www.ebay.com/itm/YANMAR-MARINE-NEW-LR155-20-ALTERNATOR-BRAND-NEW/113838371817?hash=item1a814bb3e9:g:KtIAAOSwfX9czbyu

Here's a cheaper after market option:
https://www.ebay.com/itm/New-Alternator-Yanmar-Marine-2GMFL-2GMFY-2GML-2GMYE-3GM30-3JH2-3JH3E-4JH-12107/292921047799?hash=item4433747af7:g:bloAAOSwSudcL7xl

Best of luck with the project.

Francois Rivard.
1990 34+ "Take Five"
Lake Lanier, GA
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Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[Dave via CnC-List]

Thanks Steve, will look int that further, how to test.  lots to learn on this 
as I research repair and possible upgrade.
Dave

Sent from my iPad

> On Aug 10, 2019, at 9:11 AM, Steve Thomas  wrote:
> 
> Yes there is most likely a problem with your voltage regulator, but in the 
> absence of other information, you don't know for certain. One other thing 
> that just might be going on is very low output caused by poor contact between 
> the brushes and the slip rings. If there is lots of current available to 
> charge the battery when mostly depleted, but only up to 12.6 volts, then 
> regulator it is. 
> 
> Steve Thomas
> Yanmar YSB12
> Yanmar 3HM35F
> Way too many other vehicles. 
> 
>  Dave S via CnC-List  wrote: 
> Thanks Neil - and yes sounds similar.  I have the smaller acr which has 
> on-board led indicators.   I gather you needed the larger unit for a higher 
> output alternator.
> According to the support docs, the charge source has to exceed 13.7 v for a 
> period of time for the batteries to combine.  On the shore charger the 
> batteries see 14.28 v from the charger, and settle at 13.2v fully charged, as 
> do yours. 
> Here’s the installation:
> http://cncwindstar.blogspot.com/p/blog-page.html?m=1
> I missed and will add the ability to monitor the voltage on the start 
> battery, this will give all the necessary info.
> Off to the alternator shop...
> 
> Dave. 
> 
> Sent from my iPhone
> 
> 
> 
> 

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Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[Russ & Melody via CnC-List]

Hi Dave,

Many years ago I had low voltage on alternator 
output and found it to be a bad diode in the 
rectifier... just one more thing to check.


Cheers, Russ


At 01:40 PM 8/9/2019, you wrote:

Hi All,Â
I have a yanmar 2GMf20 with what I believe is 
the stock 55 amp alternator.   I noticed that 
my ACR was not combining batteries, which led me 
to research a bit then measure the voltages on 
each bank, and then at the alternator “Batt” terminal. Â
Irrespective or RPM or battery state, the 
voltage at the BATT terminal does not exceed 
12.63 in operation.   (he ACR therefore 
doesn’t “see” a charging state)  The belt is new and not slipping.Â
This suggests and alternator or regulator 
problem.   Does this make sense?  Is there anything else I should check?
If I end up replacing the regulator, are there 
better options for this alternator than stock?


Thanks All.

Dave



Sent from Mail for Windows 10

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Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[Steve Thomas via CnC-List]

Yes there is most likely a problem with your voltage regulator, but in the 
absence of other information, you don't know for certain. One other thing that 
just might be going on is very low output caused by poor contact between the 
brushes and the slip rings. If there is lots of current available to charge the 
battery when mostly depleted, but only up to 12.6 volts, then regulator it is. 

Steve Thomas
Yanmar YSB12
Yanmar 3HM35F
Way too many other vehicles. 

 Dave S via CnC-List  wrote: 
Thanks Neil - and yes sounds similar.  I have the smaller acr which has 
on-board led indicators.   I gather you needed the larger unit for a higher 
output alternator.
According to the support docs, the charge source has to exceed 13.7 v for a 
period of time for the batteries to combine.  On the shore charger the 
batteries see 14.28 v from the charger, and settle at 13.2v fully charged, as 
do yours. 
Here’s the installation:
http://cncwindstar.blogspot.com/p/blog-page.html?m=1
I missed and will add the ability to monitor the voltage on the start battery, 
this will give all the necessary info.
Off to the alternator shop...

Dave. 

Sent from my iPhone



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Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[Dave S via CnC-List]

Thanks Neil - and yes sounds similar.  I have the smaller acr which has 
on-board led indicators.   I gather you needed the larger unit for a higher 
output alternator.
According to the support docs, the charge source has to exceed 13.7 v for a 
period of time for the batteries to combine.  On the shore charger the 
batteries see 14.28 v from the charger, and settle at 13.2v fully charged, as 
do yours. 
Here’s the installation:
http://cncwindstar.blogspot.com/p/blog-page.html?m=1
I missed and will add the ability to monitor the voltage on the start battery, 
this will give all the necessary info.
Off to the alternator shop...

Dave. 

Sent from my iPhone

> On Aug 9, 2019, at 10:37 PM, Neil Gallagher  wrote:
> 
> Dave,
> 
> Interesting question for me, as just a few days ago I installed an ACR and 
> have been watching the voltage on the house bank, (alternator output is to 
> the starting bank only) by which I can see when the ACR combines.  It seems 
> to be at about 13 to 13.2 volts, so it does sound like your 
> alternator/regulator is not putting out high enough voltage.   On my ACR 
> (Blue Sea 7610) you can put in an LED that lights up when it combines, just 
> to be sure.
> 
> Neil Gallagher
> Weatherly, 35-1
> Glen Cove, NY
> 
>> On 8/9/2019 4:40 PM, Dave S via CnC-List wrote:
>> Hi All, 
>> I have a yanmar 2GMf20 with what I believe is the stock 55 amp alternator.   
>> I noticed that my ACR was not combining batteries, which led me to research 
>> a bit then measure the voltages on each bank, and then at the alternator 
>> “Batt” terminal.  
>> Irrespective or RPM or battery state, the voltage at the BATT terminal does 
>> not exceed 12.63 in operation.   (he ACR therefore doesn’t “see” a charging 
>> state)  The belt is new and not slipping. 
>> This suggests and alternator or regulator problem.   Does this make sense?  
>> Is there anything else I should check?
>> If I end up replacing the regulator, are there better options for this 
>> alternator than stock?
>>  
>> Thanks All.
>>  
>> Dave
>>  
>>  
>>  
>> Sent from Mail for Windows 10
>>  
>> 
>> 
>> ___
>> 
>> Thanks everyone for supporting this list with your contributions.  Each and 
>> every one is greatly appreciated.  If you want to support the list - use 
>> PayPal to send contribution --   https://www.paypal.me/stumurray
>> 
> 
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Re: Stus-List Hitachi 55A alternator question - 12.63 v output...

[Neil Gallagher via CnC-List]

Dave,

Interesting question for me, as just a few days ago I installed an ACR 
and have been watching the voltage on the house bank, (alternator output 
is to the starting bank only) by which I can see when the ACR combines.  
It seems to be at about 13 to 13.2 volts, so it does sound like your 
alternator/regulator is not putting out high enough voltage.   On my ACR 
(Blue Sea 7610) you can put in an LED that lights up when it combines, 
just to be sure.


Neil Gallagher
Weatherly, 35-1
Glen Cove, NY

On 8/9/2019 4:40 PM, Dave S via CnC-List wrote:


Hi All,

I have a yanmar 2GMf20 with what I believe is the stock 55 amp 
alternator.   I noticed that my ACR was not combining batteries, which 
led me to research a bit then measure the voltages on each bank, and 
then at the alternator “Batt” terminal.


Irrespective or RPM or battery state, the voltage at the BATT terminal 
does not exceed 12.63 in operation.   (he ACR therefore doesn’t “see” 
a charging state)  The belt is new and not slipping.


This suggests and alternator or regulator problem.   Does this make 
sense?  Is there anything else I should check?


If I end up replacing the regulator, are there better options for this 
alternator than stock?


Thanks All.

Dave

Sent from Mail  for 
Windows 10




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every one is greatly appreciated.  If you want to support the list - use PayPal 
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Stus-List Hitachi 55A alternator question - 12.63 v output...

[Dave S via CnC-List]

Hi All,  
I have a yanmar 2GMf20 with what I believe is the stock 55 amp alternator.   I 
noticed that my ACR was not combining batteries, which led me to research a bit 
then measure the voltages on each bank, and then at the alternator “Batt” 
terminal.   
Irrespective or RPM or battery state, the voltage at the BATT terminal does not 
exceed 12.63 in operation.   (he ACR therefore doesn’t “see” a charging state)  
The belt is new and not slipping.  
This suggests and alternator or regulator problem.   Does this make sense?  Is 
there anything else I should check?
If I end up replacing the regulator, are there better options for this 
alternator than stock?

Thanks All.

Dave



Sent from Mail for Windows 10

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