2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

*** high output alternator ***

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Old Apr 4, 2008 | 06:49 PM
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*** high output alternator ***

does anyone have one installed on thier car or know of any place that deals them???

seems like my electrical system could use a boost...
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Old Apr 4, 2008 | 06:51 PM
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Originally Posted by 7fold
does anyone have one installed on thier car or know of any place that deals them???

seems like my electrical system could use a boost...
nope,

yes. use a 3rd gen rx7 alternator.
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Old Apr 4, 2008 | 06:57 PM
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Originally Posted by SirCygnus
nope,

yes. use a 3rd gen rx7 alternator.
do they bolt right up?
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Old Apr 4, 2008 | 07:34 PM
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i did... couldnt find anything that totally answered my question...

i was looking to see what wiring changes have to be made to get the 3rd gen working on a fc
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Old Apr 4, 2008 | 09:19 PM
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yes it will bolt right up, I just needed to use a couple spacers so the pullies line up correctly. You are going to need a new pulley for it as the 3rd gen alts come with a pulley designed for a serpentine belt, and the 2nd gens use V belts.

Wiring it up isn't hard at all, just need one of the two wires coming from the current connection going to the alt, not sure which one off the top of my head, and then you need to make another one that has 12v on it at all times. connect those with the two wires on the 3rd gen connector and your done. Again, I am not sure about the wire colors but I can get them for you if needed.
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Old Apr 5, 2008 | 12:19 AM
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Originally Posted by My88Se
yes it will bolt right up, I just needed to use a couple spacers so the pullies line up correctly. You are going to need a new pulley for it as the 3rd gen alts come with a pulley designed for a serpentine belt, and the 2nd gens use V belts.

Wiring it up isn't hard at all, just need one of the two wires coming from the current connection going to the alt, not sure which one off the top of my head, and then you need to make another one that has 12v on it at all times. connect those with the two wires on the 3rd gen connector and your done. Again, I am not sure about the wire colors but I can get them for you if needed.
thanks man, hmmm, i think it would be worth it for me to pick one up... also, couldnt you just use the pully off the 2nd gen alternator your taking off?
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Old Apr 5, 2008 | 12:41 AM
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The one I had on my stock alt wouldn't work, there is a little nub on the front of the fd alt that was basiclly going to rub against the one I had. But I had underdrive pullies on the stocker, so I am not sure if the stock pulley will work or not, seeing as I didnt have one.
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Old Apr 5, 2008 | 12:51 AM
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different size shafts from s4 to FD..so you need to do a little Modification..Try Silverrotor(moderator in the CDN section) he sells these with the Pulley already to go(either a double pulley or a single,your choice) and the connector.Tell him STYX sent ya.
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Old Apr 5, 2008 | 12:54 AM
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^^^I got mine from Silverrotor as well. So I just got the pulley with it, worked like a charm.
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Old Apr 5, 2008 | 01:24 AM
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thanks guys, i pm'ed him...
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Old Apr 5, 2008 | 08:38 AM
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Another option is to just buy a standard high output aftermarket one wire alternator. These are available from almost any supplier to fit Chevys and Fords with outputs well above 100A. It will take a bit of fab to make brackets to mount, but if you've done something like that before it will be easy.
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Old Apr 5, 2008 | 10:24 AM
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thats very true... maybe when i get back home to my beautiful shop i can look into that...
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Old Apr 5, 2008 | 11:42 AM
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S4-S5-S6 Alt wiring......
Attached Thumbnails *** high output alternator ***-intergeneration%2520alternator%2520wiring.gif  
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Old Apr 5, 2008 | 12:12 PM
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So looking at that diagram Mandrake, You would have to take the the S plug on both the S5 and S6 Alt's and run that to the ignition correct? Aka, the other wire :P
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Old Apr 6, 2008 | 12:00 AM
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I got mine from SilverRotor.. with a double pulley.. hook up was easy & straight forward. do it right. do it once & be done with it. It costs more to experiment.

Ramses666
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Old Apr 6, 2008 | 01:56 AM
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Originally Posted by ramses666
I got mine from SilverRotor.. with a double pulley.. hook up was easy & straight forward. do it right. do it once & be done with it. It costs more to experiment.

Ramses666
how do i get a hold of him? i would like to get me one!
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Old Apr 6, 2008 | 08:12 AM
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i dont know if your driving an S4 or S5 and you really dont specify how much of a gain in amperage you need so ill go from there..
if your in an S4, get an S5 alternator. someone probably knows these numbers better than me but i think the S4 is rated @ 70 amps and the S5 alternator pushes 85 amps? the swap is as simple as reading one of the short sweet tutorials you can find with a simple search on the forum and is a breeze to any monkey who can splice a wire
some/most alternator rebuilders can refurb that alternator to a higher amperage. who knows what they can pull out of this small alternator but im sure they can get a 10-20 amp gain.
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Old Apr 6, 2008 | 09:56 AM
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I haven't seen Silverrotor around here for quite sometime... Try sending him a P.M.
I paid like $190 for my S6 100 amp alternator with a double pulley including shipping to fit my S4 about 3 years ago. That was pretty expensive but I was/am very happy with it.

Ramses666
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Old Apr 20, 2008 | 10:21 PM
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I PM ed silverrotor, let's see if he is around. My rig is a s4 T2, with a serpentine double pulley/belt but I want a SHINY one. cliff
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Old Apr 20, 2008 | 10:28 PM
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i did too, he told me that he no longer does these... got to figure something else out
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Old Apr 20, 2008 | 10:44 PM
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It would probably be way cheaper to have yours rebuilt/beefed up at an alternator shop.

Ramses666
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Old Apr 20, 2008 | 10:45 PM
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Ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh,
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Old Apr 21, 2008 | 12:09 AM
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Originally Posted by Aaron Cake
Another option is to just buy a standard high output aftermarket one wire alternator. These are available from almost any supplier to fit Chevys and Fords with outputs well above 100A. It will take a bit of fab to make brackets to mount, but if you've done something like that before it will be easy.
I'm surprised your post didn't get more interest. Have you done this with success?
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Old May 30, 2008 | 10:32 AM
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I have an aftermarket high output alternator (rated 180amp) that was designed for the FC/FD. You will have to make your pulley fit, but that is all. $225 shipped. I paid $450+ for it and put, maybe 6000 miles on it. PM me for pictures if you are interested.

This alternator was rated 150amp at 200 degrees F. So it probably puts out even more than 180amps cold (which is what other manufactures use for their ratings).

here is the thread i bought it from. I bought it in 2007, in October...it was completely new at the time.

https://www.rx7club.com/showthread.p...put+alternator

Last edited by cozmo kraemer; May 30, 2008 at 10:45 AM.
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Old May 30, 2008 | 06:25 PM
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I had my stock alternator upgraded, but I have a competent shop around here that will do it. Apparently many areas don't. So far it's lasted over two years.
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