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Re: Alternators

The alternators are interchangeable,but the internal parts are different.I
know this for fact due to buying parts for several years of S.V.O.'s.
At 09:52 AM 9/10/97 -0400, Dave Compton wrote:
>Neil said:
>> Stock output is
>> rated at 65 amps.The early alternators differ internally from the late
>> model units, although both are rated the same from Ford.The late model
>> units also seem to have a much higher failure rate than the earlier
>> units.They seem to always fail on me under racing conditions.Most of the
>> replacement units you buy over the counter seem to only be the 55 amp
>> from the local auto parts stores, because they are not truely the correct
>> units for the S.V.O.'s, even though that is how most aftermarket parts
>> books list them.I hope this information helps.If you have changed
>> alternators check for the correct output from the alternator
>> manufacturer.
>I should've known there'd be a difference between years.  I'll do whatever
>I can to get you the correct alt for a later model car.  Mine's an 84.  I
>put on the new unit this weekend and it's working fine.  I'm gonna get the
>old one dissected.  I'm betting it's a bad diode.
>> Do not go by what is on the case if it is a rebuild or
>> remanufactured unit.
>In regards to this statement;  I don't know if you are referring to some
>casing stamping, or what, but these units have a sticker on them that show
>what their actual output was after the rebuild.  They are tested at 14 V
>output and the current supplied is written on the sticker.  My unit put out
>76 AMPS at 14 Volts during the final bench testing.  I would be more
>interested in what the alternator ACTUALLY put out than what it's suppoed
>to put out.  This sticker tells you what the one *in your hand* can do.
>This place also has a softcover booklet written for the marine market that
>describes alts, batts, and other electrical stuff.  Some marine info, but
>it's still got good bare bones info.  Written by mechanics, for mechanics,
>it says.  I know quite a bit about this stuff and it was still an
>interesting book.  Recommended if you have trouble figuring out if your alt
>is bad or your battery.  I'll supply em for $13.50 delivered.  I don't make
>a dime on this, just trying to help you guys out.