Alternator amperage

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Apr 23, 2016 | 09:47 AM

antoniov1

Thread Starter

Racer

Joined: Aug 2015

Posts: 360

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From: Abilene Texas

Alternator amperage

I got a 82' and need to know if I got a 70 amp alternator

or non 70 amp how do I tell?

Apr 23, 2016 | 06:41 PM

carriljc

Le Mans Master

Joined: Jan 2001

Posts: 6,726

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take a look at this thread:

it has images and whatnot for 82 alternators:

see post #9 for image of where amps are etched/stamped into case:

https://www.corvetteforum.com/forums...my-1982-a.html

Last edited by carriljc; Apr 23, 2016 at 06:42 PM.

Apr 23, 2016 | 06:43 PM

vbgod1

Racer

Joined: Mar 2014

Posts: 316

Likes: 39

From: Machesney Park IL

I can't tell from the picture, but almost all GM's I have ever seen have had it stamped on the case somewhere. Your pic makes me think it has been painted, so it may be under that.

Apr 24, 2016 | 03:14 AM

LT1M21Vette

Burning Brakes

Joined: Nov 2014

Posts: 947

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From: Foothills of the Adirondacks.

Don't know, but your wiring screams "zero amp soon"...

Apr 25, 2016 | 08:28 PM

antoniov1

Thread Starter

Racer

Joined: Aug 2015

Posts: 360

Likes: 1

From: Abilene Texas

What's wrong with the wiring? I found the numbers on the front of the alternator I couldn't see it cause it was a little dusty

Apr 25, 2016 | 11:56 PM

sullyman56

Drifting

Joined: Nov 2013

Posts: 1,546

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From: Scottsdale Arizona

Quote:

Originally Posted by LT1M21Vette

Don't know, but your wiring screams "zero amp soon"...

Apr 26, 2016 | 03:49 AM

David Sadakane

4th Gear

Joined: Apr 2016

Posts: 4

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From: Huntington Beach California

Quote:

Originally Posted by carriljc

see post #9 for image of where amps are etched/stamped into case:

https://www.corvetteforum.com/forums...my-1982-a.html

I may be young (21) and inexperienced (this is my first post on a car forum ever) but I have an '82 that I've been working on with my uncles and can tell you that the above is spot on.

That said, I read that 70A was stock when I had to get mine replaced and that if its the original part you should be fine. Those numbers should be right under the tensioner bolt on the belt side but can't tell from that picture. You're looking for something like a "70A" stamped on it

Apr 26, 2016 | 07:05 AM

gungatim

Burning Brakes

Joined: Apr 2008

Posts: 1,222

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From: shelbyville West Michigan

Quote:

Originally Posted by antoniov1

What's wrong with the wiring? I found the numbers on the front of the alternator I couldn't see it cause it was a little dusty

wiring looks like crap, broken insulation, missing plugs, crimp connectors, etc.

your alternator is a 10si, they came in 37,42,55,61, and 63 amp versions. if you had AC, and was a 70 amp stock, it would have been a 12si alternator. what you have is not original, and old (notice the smaller rear bearing), and since it's been painted and rebuilt, the wiring hacked, it's anybody's guess what is actually inside that case. the case may not even be a GM case as over the years they have been cloned in rebuild houses...