Identifying alternator - Team Camaro Tech
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post #1 of 6 (permalink) Old Sep 13th, 05, 07:21 PM Thread Starter
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Question Identifying alternator

This one has BAT, and the R 1 & 2 electrical blades. No GND. It has a black plastic fan.


I'm assuming it's internally regulated as witnessed by the heat sinks on those capacitors inside and the blade layout. A CS130 will have 4 thin pins instead of blades, correct?

I have another one like the alternator shown, except that it mounts 180 degrees from the way this one does, and it has a metal fan.

I already know which type of vehicle to get a CS from over the counter. But how can I tell if the two that I have are 10 or a 12SI? Impossible, right?
These two are only cores, but depending on what my engine harness is setup for will determine whether I replace it, or go straight to a CS conversion. I have two harnesses for the car.....

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post #2 of 6 (permalink) Old Sep 14th, 05, 04:23 AM
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Re: Identifying alternator

Quote:
Originally Posted by HwyStarJoe
It has a black plastic fan.

I have another one like the alternator shown, except that it mounts 180 degrees from the way this one does, and it has a metal fan......
This one with plastic fan is a 10SI. Steel fans are 12SI.

Clocking of the rear housing can be changed by removing the four "case" bolts and rotating the rear housing to a configuration of your likening.

Yes, CS130's have four pins rather than two blades.

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post #3 of 6 (permalink) Old Sep 14th, 05, 06:36 AM Thread Starter
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Re: Identifying alternator

OK, that's what I thought about rotating the case for mounting. Read that in past threads.
What amp ratings do the two alternators have? Is that strictly a matter of which vehicle it was designed for, or do 10SI and 12SI units have specific ratings?

Thanks Everett.

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post #4 of 6 (permalink) Old Sep 14th, 05, 10:29 AM
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Re: Identifying alternator

They have specific ratings for each. It eludes me for the moment, CRS comes & goes...........any parts store should be able to tell you
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post #5 of 6 (permalink) Old Sep 14th, 05, 11:00 AM
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Thumbs up Re: Identifying alternator

Quote:
Originally Posted by HwyStarJoe
OK, that's what I thought about rotating the case for mounting. Read that in past threads.
What amp ratings do the two alternators have? Is that strictly a matter of which vehicle it was designed for, or do 10SI and 12SI units have specific ratings?

Thanks Everett.
Hey Joe;

That's a Delcotron 12SI Alt.* They were available in a couple output amp. ratings.
The best site for info is - http://www.madelectrical.com/electri...elcoremy.shtml - Mark really knows what he's talking about.
The case can be re-clocked to suit your needs and MAD can sell you the internals you may need to get the output you need.

I've converted dozens of cars (lots of Furds - their $hit sticks...) and boats to this alternator - they were the best for years.


Hope this helps;
John M
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post #6 of 6 (permalink) Old Sep 14th, 05, 12:11 PM Thread Starter
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Re: Identifying alternator

Yeah, MAD Electricals site is a WEALTH of information.
Looks like this one is a 78AMP 12SI. Good enough for me! I'll just ask for one from an '85 Firebird when I exchange it.


Thanks guys!

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