Alternator wiring

[fastmonkeywheel]

I have a serpentine belt setup on my 2.3 T that I got from a Fuel injected 2.3 Mustang out at the junk yard, I think it was an 87-93 if I remember correctly. Anyways, I'm getting around to wiring up the alternator and can't find a wiring diagram for it. I also don't know if I need a voltage regulator for it or not.

The harness I have for it has 2 plugs on one end (go into the alternator) and 3 wires on the other side. One wire is a large blk/orn wire that I'm pretty sure goes to the battery side of the starter solinoide, but what about the other two wires? I figure they are what turns the alternator on but why two of them? A wiring diagram or any info on this alternator is appreciated.

If I can't get it figured out I'll probably take it to Schucks and have them match it up with one they have from thoes Mustangs then see if I can find a wiring diagram for it.

Thanks

 

[85 Coupe 5.0]

been a while but here goes......

On the long rectangle shaped plug, you will have 3 wires. two black and orange and one white one, possibly with a black stripe on the white one.

the two larger black and orange ones go to the battery or battery side of the starter solenoid.

the white one goes to the other plug on the alternator, which i will clarify below.

the other plug on the alt is a smaller one, with 3 smaller wires going to it. i believe the colors are, yellow with a white stripe, white with a black stripe, and light green with a red stripe.

ok, here goes on the hookup.

the two larger black with orange wires go as stated to the battery or solenoid.
The smaller white wire with a black stripe on the same plug as the black and orange ones ties directly to the black and white wire on the smaller plug.

the smaller plug

The yellow wire with the white stripe goes to the battery, this is the voltage sense wire for the regulator.

the light green with red stripe wire goes to a switched ignition source, that ONLY gets power when the ignition switch is in the on position.

that's it, hook it up that way and it will charge.

You don't need a regulator with this alt, the wires we are discussing go to the regulator, that small plug, it plugs directly into the regulator.

phew, my hands hurt.

 

[fastmonkeywheel]

Thanks for such an informative post. I found the wiring diagram already in another Chilton's I have. However I'm a little confused on one part. In my diagram the switched ignition source is tapped from the same line on the ignition switch that powers the ECU relay (or biases it). That line gets power in both RUN and START. I just want to confirm that it's OK to use this wire for the alt switched power source. Your post was a little confusing in this area.

Again thanks for taking the time to reply to such an old post, at the least you'll confirm my current wiring state. At the most you'll help me from frying my ALT as soon as I crank this engine over.

P.S. I just noticed that you're a Factory Ford Technician . Any chance we could communicate over another medium (email or PM)? I have a few questions and have actually been trying to get ahold of someone in that division for possible career information.

 

[85 Coupe 5.0]

Absolutely, I'd love to help ya with career info. I absolutely love my job. Always working on new vehicles, all the current diagnostic tools, it's great.

On the Alt wiring.

Yes, that line should be the correct one to use, and I probalby should have stated that in my previous post. I was using a wiring diagram for a Tempo to create the above post, but almost all of those 2nd generation alts are wired the same.

Other than that, she'll charge just fine, just make sure the alternator is mounted to the engine and all the plugs are plugged into it before you re-connect the battery.

Hit me up at:

[email protected]

If you need any info.

I'm not allowed to provide you with any factory repair information or any information about Ford service procedures in general due to my privacy contract, but I can help you with career info, and maybe give you a little insight into what the technician life is like.

l8ter.