Hitachi alternator terminal identification !

[Blue_Pearl]

Hi all, this might sound a bit stupid, but I've just taken delivery of a new Hitachi alternator for my 3GM30 and I'm confused.com

Attached is a picture I've just taken of it ............ the "T" connector is the only one that I'm happy knowing what is connected to it ............ the other terminals (and the green "flying lead" are confussing me no end. All I want to know is where my red wire goes and where the black wire goes ! The three terminals only two are identified - and then the BAT terminal as far as I can see can be interpreted as being iether one of 2 terminals depending on which way you look at it.
Help

 

[pvb]

 

[Blue_Pearl]

Many thanks, thought it was like this first of all (apart from not knowing what the green wire was) but ended up convincing myself that it could be a range of other configurations ! Right, off to the boat to fit it then

 

[Ubergeekian]

Angonamo. If that alternator is like my new alternator - and that alternator looks exactly like my new alternator, the flying lead is NOT a smart regulator connection. It's a rev counter connection, going to one of the armature windings. Goodness knows what would happen if it was connected to a smart regulator!

 

[pvb]

Angonamo. If that alternator is like my new alternator - and that alternator looks exactly like my new alternator, the flying lead is NOT a smart regulator connection. It's a rev counter connection, going to one of the armature windings. Goodness knows what would happen if it was connected to a smart regulator!

OK, could well be. I'm just used to seeing alternators pre-prepared for smart regulator installation.

 

[VicS]

I'd expect the connection for the tacho to be labelled "P"

The GM series I think have a engine mounted sensor for the tacho rather than using the alternator.

 

[pvb]

The GM series I think have a engine mounted sensor for the tacho rather than using the alternator.

Yes, an electromagnetic sensor counting the teeth on the flywheel.

 

[Ubergeekian]

OK, could well be. I'm just used to seeing alternators pre-prepared for smart regulator installation.

It raised my hopes, too....

 

[Blue_Pearl]

Unfortunately the wiring was not as suggested ! I connected as suggested and flipped the main battery switch on and immediately smoke appeared at the terminals !!!! process of illimination determined that the threaded hole next the the letter "E" is in fact the earth and the terminal closest to the "BAT" the battery connection.
Just after I posted on here the supplier however got back to me with an email stating the same connections pvb ! .......

I've now connected the alternator as above (using the threaded hole as earth and the Terminal closest to the BAT as battery) and all works fine ........ Mind you I've yet to measure the voltage output at higher revs, but the charge warning light extinguished as soon as the engine started.

Note to self - get a pro to install it next time !

 

[pvb]

Japanese, innit? They'll never succeed in global mass production.

 

[Blue_Pearl]

Japanese, innit? They'll never succeed in global mass production.

I should have known it'd be bum about face ......... I worked there for 3 years ! they were never very good at the iggerish translation and technical manuals

 

[grumpygit]

Japanese, innit? They'll never succeed in global mass production.

Being too late picking up this thread........Why connect an Battery negative to a insulated terminal when the alternator is obviously not insulated return?

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[VicS]

Being too late picking up this thread........Why connect an Battery negative to a insulated terminal when the alternator is obviously not insulated return?

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Why is it obviously not insulated return?

 

[steve28]

mine the exact same alternator and its connected to the insulated negative terminal, strapping it to the case just bypasses that diode inside ?