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Old 06-08-2016, 05:06   #31
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Join Date: Apr 2011
Location: NZ
Boat: S34 Bob Stewart - 1959 Patiki class. Built by me & good mate.
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Re: Yanmar 3GM30 alternator wiring....

Looking at both circuit diagrams, they are both negative brush to earth regulated.
I don't know what the inside of a Hitachi looks like, but my ADR0439
looks identical to a delco 10si.

https://alternatorparts.com/10si-15s...al-page-2.html

What I have drawn is easy so I'm happy-- as long as it works.
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Old 06-08-2016, 21:37   #32
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Re: Yanmar 3GM30 alternator wiring....

For id of my purchase- see attached sales speil.
As you kindly pointed out, I have the option of either, with MG's regulator, which suits me in case I want to run a 614 later.
Maybe your Alternator is a hitachi clone.
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Old 08-08-2016, 06:29   #33
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Re: Yanmar 3GM30 alternator wiring....

Thanks for straightening me out.
I stand corrected. I got bad information from the Sterling regulator installation manual, page 5 on http://www.sterling-power-usa.com/li...structions.pdf

It seems the vast majority of alternators are negative field control, and Balmar is one of the few (only?) manufacturers clinging to positive field control. I like the features on their regulator, but I'm a little chagrined that they don't accommodate neg field alternators.

Oh well. At least I was able to convert my alt to use the Balmar reg, and I can switch it back if I ever need to dump the Balmar.

Fair winds,
-b
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