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Old 06-11-2008, 01:51 AM
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Earlier or later alternator on a Chevy

I got the original alternator on a second gen camaro, I need a new one but I want to know if I can replace it with maybe with a 90-94' unit , I think these make more amps

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Old 06-11-2008, 02:15 AM
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they make more amps... but at significant monerary costs...

you can get 10SI delcos and 12SI alternators in factory apps up to 125 amps... like a 7287.... look for appls on 87 cad devilles with rear wheel drives... the high amp alternators on that app use a threaded ajuster... so the small end is drilled and not tapped...... the nice thing is you can get high amp kits from many sources to drop into your case or a new case...

once alternator supply in portland ore.. even had superhigh output kits that allow the the alternator to supply welding power... i don't know if they still offer these kits...

the important thing is to get a better rectifier bridge.. most of the standard output bridges... have 6 - 25 amp 100 piv diodes..(peak inverse voltage diodes) the better ones use... 6 - 50 amp 200 piv diodes... so much better ... only a few bucks more... the voltage regulators can also be swapped for better models... with higher amp rotor ratings...

the voltage regulator pulses power through the brushes to the rotor... this rotating magnetic field breaks the stator windings as it goes round.. more magnetic field ... more output... through the diodes..

the higher amp alternators have differnt rotor windings.. that draw more power... to make them last ... install a properly rated voltage regulator...

the wai page on the transpo-usa.com has a great catalog... but the parts are only available through their dealers..( rebuilders) but with a part number... you are ahead of the game...

the later alternators have diodes that will not last as long as the older ones.. and are not user serviceable.. out on the road...


Last edited by 69612; 06-11-2008 at 02:17 AM. Reason: additional info...
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Old 06-11-2008, 06:58 AM
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Here´s a bunch of stuff about alternators etc.
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