I recently had a Painless wiring harness installed and need help hooking up the alternator to the Painless harness.

The Delco/Remy alternator has a battery connector and a 2 wire plug connector, neither plug wire is connected at this point so I need help determining which wire goes where.

The Alternator plug wires are labeled F (brown/white) and S (red). Two wires coming from the Painless harness are labeled “Alternator Regulator Axcitor #914” (white) and “Alternator Output Post #915” (Red) which is already connected to the battery terminal of the alternator.

My question:

What do I connect the alternator “brown/white” and “red” plug wires to which of the Painless wires “white #914” and “red #915”? Keep in mind the “white” Alt./Reg./Axcitor Painless wire isn’t connected at this point nor are the two alternator plug wires (brown/white & red).

If this doesn’t make any sense feel free to straighten me out because I'm at a loss and wiring is definitely my weak point.

Thanks for any and all help.

On the Delco (10si?)
the 'F' wire is the Field
(the power that you put back IN so the electro magnet in the center which is spinning can generate voltage on the outer windings)
the 'S' wire was used for the dummy light on the dash

It would seem that the Exciter wire would be the same as the field (the field is what excites the outer windings):p

Connect the # 914 white (field) to the #1 plug/post on the alt.

Connect the # 915 red to the # 2 post of the plug/post on the alt.



http://www.monsterslayer.com/jeep/Pics/AltWiring.jpg

http://www.monsterslayer.com/jeep/Pics/AltWiringDiag.jpg

Thanks Jaffer, my concern was that I have this pigtail connector and the brown/white wire on the pigtail is labeled "F" (which I connected to #914 and the red wire is labeled "S" which I connected to #915. The alternator instructions I received from painless claims the ignition source labeled "L" should be connected to the #914 and mine is coming from "F" and then they go on to say when not using a charging light to use a 15 OHM 2 Watt resistor to prevent premature failure of the regulator. Is this a must or should I just hook it up and see what happends?

Originally posted by KeithF
...they go on to say when not using a charging light to use a 15 OHM 2 Watt resistor to prevent premature failure of the regulator. Is this a must or should I just hook it up and see what happends?


I did the (non-terminated version CJ) "Painfull" wiring and an MPI FI kit install at the same time.
The MPI instructions made in clear that it was important to splice onto the field wire a diode provided in their kit to "protect the new electronics".
I'm sure these guy know more than you or I.;)

I'd go ahead and put the resistor in the line, Keith.
BUT first I'd check to see if there wasn't already one inside that funny looking plug. An Ohm meter should tell ya.

Originally posted by KeithF
then they go on to say when not using a charging light to use a 15 OHM 2 Watt resistor to prevent premature failure of the regulator. Is this a must or should I just hook it up and see what happends?

Install the resistor. :D

On the internally regulated delco alternators the "ignition" connection has two functions:
1. Alternator regulator is turned on when "ignition is switched on"
2. Connection will be grounded when there is an electrical fault (no output).

Catch is SOME alternators will work just fine if that wire is connected to +12V directly, as they will limit the current flowing into that terminal. Other alternators will fry the internal regulator in that case. :( You can not determine what will happen until it does. Resistor allows either to work just fine without damage.

For the EE's in the group, the MC33092 Datasheet (http://e-www.motorola.com/brdata/PDFDB/docs/MC33092A.pdf) will give an insight into the regulator.

Tom :usa: