[DeTomaso] GM 12SI Alternator Connection ???

[Steve Liebenow]

 OK, after some great responses from folks, it seems like I had it correct below.
Terminal #1 connects to "dash light" in speedo via Blue/Black wireTerminal #2 is the sense or turn on, or exciter input and can either be switched or full power (unswitched).  This is generally the yellow wire which was connected to the "I" Terminal of the voltage regulator.   Previous owners had already connected this to the hot side of the starter solenoid.   Good a place as any as it will sense battery voltage back thru the giant cable up to the battery.
THANKS TO ALL who have responded!!!  Big help and moral booster that I'm on the right track. "Kits" can leave a LOT to be desired.....some lacking, some less lacking!
On to today's adventures in heater hose routing and retention!!!    Wiring clean up after that!
Cheers!
Steve

    On Wednesday, April 6, 2022, 4:23:45 PM PDT, Steve Liebenow <steven.liebenow at att.net> wrote:  
 
 Guys,
Stumbling thru this "very easy" conversion......with absolutely no instructions other than for mounting the new AC pump/alt bracket.     Everything after that is free?   Free to find it wherever you can.......   I'll stop here for the moment.
Back history: I am removing a 130Amp Ford 3G alternator and installing a 97A GM 12si version.   No, I do not need all the amperage.......no EFI, no big stereo.....

SO, down to the two terminals on the alternator.  #1 and #2.    Bat+ is pretty evident.......duh!
This is what I can glean from Google, but who knows how good their search is these days....since I'm not looking to buy anything.....grrrrr.....  I have this:

Terminal #1 appears to be for the dash lamp and will connect to the Blue/Black(Stripe) wire formerly on the voltage regulator term "I" and this needs to be "Key ON" not 100% of the time or it will drain your battery......albeit slowly.    

Terminal #2 is the Voltage Sense and can be connected 100% of the time (or Key ON only if you like) which I believe is a Yellow wire, terminal "A" from the old harness.
Regulator Terminals  S (Green/Red stripe) & F (Orange) are no longer used. (internal stator windings and control)
If anyone can give me a thumbs up on this, it would come in handy about now.
Now I just need to find the damned new pigtail connector that I bought a couple of days back, before I started tearing my car apart!!!    It's around here somewhere......  and I'm rearranging components on my starter solenoid/coil panel to boot.  Need new room for heater hose support and my inline rust filter!  I don't want my heater hoses laying on the alternator!
Thanks in advance!
Steve
  
-------------- next part --------------
   OK, after some great responses from folks, it seems like I had it
   correct below.
   Terminal #1 connects to "dash light" in speedo via Blue/Black wire
   Terminal #2 is the sense or turn on, or exciter input and can either be
   switched or full power (unswitched).  This is generally the yellow wire
   which was connected to the "I" Terminal of the voltage regulator.
   Previous owners had already connected this to the hot side of the
   starter solenoid.   Good a place as any as it will sense battery
   voltage back thru the giant cable up to the battery.
   THANKS TO ALL who have responded!!!  Big help and moral booster that
   I'm on the right track. "Kits" can leave a LOT to be desired.....some
   lacking, some less lacking!
   On to today's adventures in heater hose routing and retention!!!
   Wiring clean up after that!
   Cheers!
   Steve

   On Wednesday, April 6, 2022, 4:23:45 PM PDT, Steve Liebenow
   <steven.liebenow at att.net> wrote:
   Guys,
   Stumbling thru this "very easy" conversion......with absolutely no
   instructions other than for mounting the new AC pump/alt bracket.
   Everything after that is free?   Free to find it wherever you
   can.......   I'll stop here for the moment.
   Back history: I am removing a 130Amp Ford 3G alternator and installing
   a 97A GM 12si version.   No, I do not need all the amperage.......no
   EFI, no big stereo.....
   SO, down to the two terminals on the alternator.  #1 and #2.    Bat+ is
   pretty evident.......duh!
   This is what I can glean from Google, but who knows how good their
   search is these days....since I'm not looking to buy
   anything.....grrrrr.....  I have this:
   Terminal #1 appears to be for the dash lamp and will connect to the
   Blue/Black(Stripe) wire formerly on the voltage regulator term "I" and
   this needs to be "Key ON" not 100% of the time or it will drain your
   battery......albeit slowly.
   Terminal #2 is the Voltage Sense and can be connected 100% of the time
   (or Key ON only if you like) which I believe is a Yellow wire, terminal
   "A" from the old harness.
   Regulator Terminals  S (Green/Red stripe) & F (Orange) are no longer
   used. (internal stator windings and control)
   If anyone can give me a thumbs up on this, it would come in handy about
   now.
   Now I just need to find the damned new pigtail connector that I bought
   a couple of days back, before I started tearing my car apart!!!    It's
   around here somewhere......  and I'm rearranging components on my
   starter solenoid/coil panel to boot.  Need new room for heater hose
   support and my inline rust filter!  I don't want my heater hoses laying
   on the alternator!
   Thanks in advance!
   Steve