85RX7GS

iTrader: (1)

Does anyone know the ampere ratings on the 2nd gen alternators? Are the 86-87 and 88-90 grouped similarly? Thanks.

S2-13BT

75 amps, I'm pretty sure. I think both series are the same.

MIKE-P-28

iTrader: (1)

I think my 88 vert is 70 or 75 I forget. The cosmo one I got is a 90 amp

mar3

iTrader: (8)

The '89-'91 TII alternators are grouped separately by ampere output which is 80 amps peak. It is also a relatively easy mod...here's the rest of the story....

The Ultimate Alternator thread with pictures, no less...

gamble302

do the 2nd gen dual alt belt kits work for us too? too lazy to search for now
gamble

mar3

iTrader: (8)

Where's DF and his graphics when you need him?? It's been brought up before and I believe the answer was "yes", but I'm too sleepy to confirm that belief right now....yawn....anybody know the definitive answer? ie., who has done it themselves...none of this "I have a friend" stuff...

82transam

iTrader: (18)

86-88 are 70 amps, while 89-91 have a different connector and 80 amp output

Jeff20B

iTrader: (13)

Heh, I've got a 55 amp 2nd gen alt. It works fine where an old stocker rated at 50 amps used to be. I don't even need to change my fuse.

Project84

'86-'88 = 70 amp.

'89-'91 = 80 amp.

'93+ = 100 amp.

These are stock numbers from the manufacturer

85RX7GS

iTrader: (1)

Thanks! That's exactly what I was looking for!

85RX7GS

iTrader: (1)

Thanks!

82transam

iTrader: (18)

no prob, you should swap them, it takes all of a half hour

82transam

iTrader: (18)

FD's use a serpentine belt system so making that work on a FB would be tough, the 80 amp 89-91 alt is more than enough power.

Directfreak

iTrader: (2)

On my Cosmo alternator (serpentine belt) I bought a Racing Beat dual pulley and drilled the hole slightly larger to fit the larger diameter spline.

While I was at it, I had a smaller diameter dual pulley drilled and prepped for the same alternator, because it is not underdriven like the Racing Beat one.

82transam

iTrader: (18)

Yea, that would do it. But then isn't there any issue with the fuseable links? The main one is rated at 80 amps, wouldn't putting a alternator bigger than that blow it constantly? Even if you swap to a FC fuseblock the main fuse is still 80 amps. Just a thought

Directfreak

iTrader: (2)

I am switching to the FC fuseblock, & moved the battery to the passenger bin. I also got a "painless wiring" additional fuseblock to control all my accesories, and additional gauges, etc.

The Cosmo amp is rated at 90 amps, so considering the additional draw and upgraded (new) wiring, I should be fine.

82transam

iTrader: (18)

Yea, sounds like your fine. I got a fc fuseblock a few weeks ago, but haven't taken the time to put it in yet. the fact that i'm kinda confused on how it is wired doens't help. oh well, thats a thread for another day.