Mainship 40 Ignition Diagram?

[jefndeb]

Hello,

I am upgrading the alternator on our single Yanmar 6LY2AN-STP, which I think is the original Hitachi 80 amp internally regulated unit to a upgraded alternator with a Balmar external regulator.

https://pbase.com/mainecruising/purchase_yanmar_externally_regulated_alternator

This external regulator requires an ignition input.

I cannot seem to find, other than I guess right at the helm switch, where in the engine area I can tap into this circuit as shown on the diagram.

Anybody have an idea where one can tap into this line at the engine or in that area?

Thanks for comments and suggestions.

By the way, from what I have researched, if you are looking for a way to extend the life of your battery banks, in terms of correctly 3 stage battery charging via your alternator, this is a pretty nice option, or you can spend $1300 for a new Balmar alternator.

Jeff
Indigo Star

 

[Bacchus]

Jeff
I'm guessing our Hitachi's are the same. Here is what I found & know.
I use the ignition feed to the alt to trigger my charging relay combining house and start/thruster bank.
On the old Hitachi the ignition feed is the R terminal - mine was stamped with letters. The R & L terminals are the small gauge wires with plug and terminals at 90* to each other.
Should be easy to confirm with a multimeter and a helper switching from the helm. So you should be able to tap into it at the alternator and avoid having to run a new wire from the helm.
I'll attach the Hitachi wiring diagram I have.

 

[jefndeb]

OK, thanks....

Here are the pictures of my alternator....do you mean that red and blue wire?

I think the blue is called the field sense wire.

Jeff

 

[Bacchus]

Yes one of those 2 wires - they are the R & L leads.
I'm not positive which is which. I couldn't find an after photo of mine to tell where I connected my ignition wire to.
Here is another alt diagram I have - if the connector/plug outline is correct it should be the "top" of the "T" shape which would be the Red
Check the backside of the alt carefully - I seem to recall mine had R & L stamped / molded in the case.

 

[Bacchus]

Jeff
Here is another piece of info from an Alternator Handbook I have.
Not exactly the same model as mine but same Int Reg series but lower output amps.
This one shows "L" as the bottom of the "T" which would be your blue wire.

Sorry I can't confirm 100%

 

[jefndeb]

Ok, thanks for all the information...

This has got me scratching my head..looks like somebody is taking a leak in my bilge..lol..can't be coolant, as mine is red, its not oily either....hmmmm..about that amount each weekend...

 

[Dougcole]

Stb side on that leak, right Jeff? I had a similar tiny leak that would manifest itself in, I think, that same area. Turned out to be a loose fitting on the freshwater pump. It turned yellowish somehow on its trip through that area outside of the stringer.


Just a thought.


It does look a little like Hydraulic fluid though, but you said it's not oily.