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.
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.
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
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
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
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
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
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,
