Bought a new alternator for my 87GT, and like a moron I bought the alternator for the 2.8, completely forgetting about the engine swap. I assume the old alternator I have is from the 3.4L/Camaro/whatever... am I right? I just need to know what to tell them at the parts counter so i get the right alternator this time around.

New, wrong alternator:


Old, correct alternator:


If you need any other images please let me know. I'm on my way to work and just threw these together in a hurry.

[This message has been edited by wikid_one (edited 08-28-2010).]

top SI alt
bottom CS130 alt, like 88 Fiero V6 use

see cave, cs alt in charge & start section
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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

[This message has been edited by theogre (edited 08-28-2010).]

3.4 can use the same Alt as the 2.8 If thats what you want. What is the car WIRED for ?(Plug) I used the same alt in mine off the 2.8 when I changed to 3.4, I just popped a new Diode pack into it & it's fine(only cost $6. !) . what brackets & wiring do you have ??

If your wiring harness is setup for the CS130 alternator (i.e. the one in your second photo), then ask for an '88 Fiero V6 alternator.

[This message has been edited by Blacktree (edited 08-28-2010).]

I asked for an 86 v6 alt with AC. I need the 4 pin connector on the top.

Well, I went back to get a new one today and ran into some issues. Advance Auto did not have the 4-pin available for any year Fiero. I had to use a 92 Camaro in the parts search in order to get the correct alternator.

If you are up to the task, the CS130 (2nd photo, 4-wire) is a superior design to the old SI and you should upgrade to it. It is very common in 87-93 cars but has different clock orientations. The best one for Fiero was a 105-amp in '87 Corvette. It's clocked correctly but you need to tap threads in the lower boss (the one for the adjuster in the Fiero's bracket). It also comes with a textured pulley that is less inclined to slip.

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- Electron Blue '88 GT ZZ430 RPFI V8 5-speed (430hp) {Construction Zone}
- Silver '88 GT 5-speed w/cammed 3.4 (160hp)
- LS1 6-speed C5 Corvette Roadster (475hp)
- LT4 6-speed C4 Corvette Roadster (350hp)
- '92 Grand Prix GTP 3.4 DOHC 284 5-speed (215hp)
- '08 Baja Reaction 150 CVT (10hp)
Keeper of the 3.4 swap pages {OHV} {DOHC}

A 92 Camaro (3.1, 5.0, or 5.7) should have the mounting points 120 degrees apart, which will NOT work in a Fiero. Fiero needs an alternator with mounting points 180 degrees apart, like your old one. Ask for an alternator for an 88 Fiero V6. If they don't have it, go somewhere else. Pretty sure Auto Zone just has a POS Valuecraft alt. I got an AC Delco from Rock Auto, and a Bosch from a local parts place.

You CAN also clean up the front case with the mounting tabs on it from your old alternator, and swap it onto another CS130 type.

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1984 Fiero SE

Yeah, the Camaro one didn't work. Why I didn't pick up on that when at the parts store I don't know, but whatever. I just returned it and went to the local electronics specialty shop. Ended up with an AC Delco 105A CS130 for $78. The CHinese one from Advance Auto was $95 plus the core.