[Spridgets] Electrical help-Alternator conversion

[Mark Haynes]

No Greg,
I don't have a part number, but Jim and Kevin's input has helped.
It appears that the I terminal needs switched 12V, the L terminal is the
charge lamp signal, and the S terminal gets battery 12V along with the B+.
There was a thread on the MGB forum about this same ND alternator
highlighting that if the S terminal isn't seeing battery voltage, you don't
get full 14+V output, so I've wired it to the B+ terminal as well.
This was supposed to be a 1 wire alternator, but it's what I've got, so I'm
working it out.
Thanks to everyone who has offered input.
I'll report back about this after I finish the rest of my mod adaptations
and get it running.



On Wed, Mar 6, 2024, 7:41 AM Greg Gowins <emailme at greggowins.com> wrote:

> Hey Mark!
>
> I'm looking back through my notes from when we wired the alternator into
> my car.  I'm assuming that the fundamentals between the one you have and
> the one I have are fairly similar.    However, the 3rd wire is the main
> difference.   I'd try it both ways, with it connected to switched power and
> without.  This particular alternator might have some kind of circuit that
> cuts everything off if it doesn't sense ignition power.    Do you happen to
> have the part number of this alternator handy?
>
> Greg
>
> On Fri, Mar 1, 2024 at 11:42 AM Mark Haynes via Spridgets <
> spridgets at autox.team.net> wrote:
>
>> I'm sliding down this slippery slope of modification and need some help.
>> I'm trying to put a ND 3 wire alternator into my BE. It's already
>> converted to Negative ground and I'm intending on rewiring the regulator
>> per Barney Gaylord to just use it as a terminal block.
>> Here's the issue, the alternator has a Battery Positive Sense (S)
>> terminal, a Keyed Battery Ignition (I) terminal and an Indicator Light (L)
>> terminal.
>> I'm assuming that the S terminal should get the 'fat' brown wire that
>> used to go to the D terminal on the regulator (new placement the A terminal
>> after rewiring), and that the L terminal goes to the small yellow wire to
>> feed power to shut off the charge light.
>> Do I need to wire the I terminal (Keyed battery ignition) so that it sees
>> power when the ignition switch is on (the white wire at A1 of the
>> regulator), or is this redundant and unnecessary?
>> TIA, the new engine/5 speed/speedhut tach & speedo are all coming
>> together to drive this spring!
>> Mark Haynes
>> It only goes one way- Pay It Forward
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