[Spridgets] Electrical help-Alternator conversion

[Michael MacLean]

Frank Clarici from the Spridget list had this figured out years ago. See
attached PDF from the old PDLJMPR web magazine.



Mike MacLean



On Wed, Mar 6, 2024 at 1:20 PM Mark Haynes via Spridgets <
spridgets at autox.team.net> wrote:

> 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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>> ------------------------
>
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>
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