Charging issues after alternator replacement

(2007 Mazdaspeed 3)
I recently threw a belt after I had just replaced it. I don’t know what caused what but the alternator was stiff afterwards. I ordered a reman from a local parts store. (I’m not spending 500 on a new one). The old alternator was charging fine before all of this happened. (The new alt is a 3 wire and I don’t know what my old one was) I replaced the alternator and belt. The new alt will not charge. I can’t find any wiring diagrams over the engine or charging system. The excite wire is NOT getting hot, no matter what I do. I’ve traced the grey wire in the alternator plug in back to the ecu. I have continuity all the way to the plug on that wire. I believe that’s the battery light wire as the alt is internally regulated. The green wire which I suspect is the excite wire runs back to the fuse box and joins like 5 other green wires in a junction that leads into one bigger wire in the engine fuse box. That wire is hot at the box. I get no connection testing between the green at the fuse box and the green at the alt plug. I took a wire and essentially “hot wired” the alternator. The alt still does not charge. I’m at a loss. This car has challenged me in every possible way and most of it still has no answer. I’ve built ecus and tuned turbo cars but apparently nothing I’ve done compares to the complexity of gosh darn internally regulated alternator wiring. Thanks I’m advance.

 

If it's internally regulated and still a 3 wire it's probably not the right setup for the car. You sure the parts store got you the correct alt?
Worst case you can do what I did and go to a 1 wire, and live with the battery light being on sporadically.

 

Well that’s what I don’t know. I called the parts store and asked if they still had my core. (They didn’t) Because the alt was still charging with half a thrown belt. The alternator plug is a 3 prong plug but has one blank with 1 grey and 1 faded green and sometimes blue wire. Can anyone give me a picture of a charging diagram with a alt pin out???? If anyone knows if a regular Mazda 3 alternator (clutch style) can bolt to a ms3 and if Mazda 3 alternators are also internally regulated. I know some of them aren’t. I think that’s my problem but I can’t find any information over this topic.

 

Here is a gen1 alternator on ebay.
https://www.ebay.com/itm/2007-2009-...2349624.m46890.l49286&mkrid=711-127632-2357-0

And one from FattiMotorWorks, who scraps Mazdaspeeds.
https://www.ebay.com/itm/Mazdaspeed...2349624.m46890.l49286&mkrid=711-127632-2357-0

 

I found on the parts store website that the alternator that “fits my car” in the discription says it’s externally regulated so I’ve found my problem halfway. I’m gonna call and either get F***** with a 500 dollar alternator or find another part store that’s more inclined.

 

Or just buy the 50$ one that works from fatti motor works those guys are legit

 

Look at my post. Fatti is legit. $50...

 

It was simply a bad reman alt. I’ll know from now on to have them test the alt before I leave the store. It comes with a lifetime warranty so I’ll be good for as long as I own the car.