On May 20, 9:50*am, wrote:
On May 20, 9:09*am, Tim wrote:





On May 20, 2:06*am, Elias Aarnio wrote:

Hi,

I am looking for a more efficient alternator for an old Yanmar 1GM
marine diesel. The original is 35 amp and I want to have something
between 50 and 60 amps. There is a bunch of webshops selling
replacements but they are all 35 or 40 amp alternators.

Does anyone happen to know a suitable replacement, a car alternator for
example? The best solution would be an alternator that also has the
sense-terminal for voltage control.

--
EliasA

Elias, what ared you wanting to do?

"Efficient" ? Your lower amp alt. will produce less drag on your
engine, a higher amp takes more engine hp, to pull itself to amke more
power.

The Yanmars have may different types of alternators depending on the
application. *if you can come up with a make and alternator number it
would help.

now comes the question of a battery sense terminal for voltage
control? are you wanting a system to adjust the voltage manually?

What is your total application and what do you want to do with it?

it helps to know....

To be exact a higher amp one does not take more engine power unless it
is called on to deliver more current. *I'm assuming the op has a
reason he wants more current like a multiple battery installation. *If
not then there is no reason to go to a larger amp one.- Hide quoted text -

- Show quoted text -

Well, actually a higher amp unit will pull more on an initial start up
or with low batterie[s], but will offer a higher recovery rate to
charge the batterie[s] quicker.Then there's the options that one adds
to draw more power than the 30/40 amp. the more energy the alternator
makes, the more energy the alternator takes.
But thinking back to the 70's a '76 chevy pick up truck that was bare
bones with only a heater and lights, the truck was only equipped with
a 37a unit. If you had air it had a 55a.. My '76 caddie sedan deville
had all the butt-wipe including rear defroster and had a stock 65a
delco.

so unless theres more to this thread than when I'm typing this, I
don't know what the OP is trying to achieve.