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Old 08-13-2012, 10:43 AM
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100a internals - 63a alternator?

I have my old alternator still from my motor swap that was originally a 100a alternator, and was replaced with the gm 61a. Iv been noticing that over time my battery is slowly draining before I start it. After its started it will hold a charge just fine. But I dont drive the car everyday and im probably on the low side of 11v pre-start up.

My question, instead of going off and buying a new alt thats any amps higher than what I have now, is it possible to swap out the internals? Iv never opened up an alt, so if it is even possible, would someone who's never seen one opened be able to do it?

Here's a couple pics of what I have. Old alternator - 100a New alternator- 61a.

Thanks for everyones help.
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Old 08-13-2012, 03:05 PM
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The max amperage for the stock 10si was 63 amps, and for the 12si I think it was 94 amps. The fan is different on a 12si, but it is the same size case and it will replace a 10si as long as both have the same type of pulley.

I think the alternator in your picture is a 10si case, and I think the two pictures are identical (maybe not?). Why do you want to swap out the internals instead of just swapping the entire alternator?

Bruce
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Old 08-13-2012, 03:43 PM
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Quote:
Originally Posted by 75gmck25 View Post
The max amperage for the stock 10si was 63 amps, and for the 12si I think it was 94 amps. The fan is different on a 12si, but it is the same size case and it will replace a 10si as long as both have the same type of pulley.

I think the alternator in your picture is a 10si case, and I think the two pictures are identical (maybe not?). Why do you want to swap out the internals instead of just swapping the entire alternator?

Bruce

The first one is the one that came in a 91 v6 camaro oem, and that is a serpentine setup, while the second one is from an 80's sbc with a v belt, so the pullys wont match up.

I wanted to swap out pullys and just bolt it right on up there, but I dont have a bracket to mount the old alt. Iv looked, but never came up with anything. I didnt look to see if the v8's had the same bolt pattern or not, but then I would most likely have to go to the dealership and find what kind of bracket to get.
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Old 08-27-2012, 12:14 PM
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well for anyone that has done a swap like this before and want to know:

It is possible to keep your old alternator, if you keep your wiring harness it should plug right back in if you know which one it is, and keep one of the smaller brackets for the alt, and you can put the two (new and old brackets) together and mount it in there without changing belts. If you want to you can get a longer belt and just use the alternator bracket for a late moddle. But if you gutted your wiring, you can also run a single wire from ( if youre looking at the alternator mounted, the far right connector ) to the post on the back.

My issue is running an elec fan, heater, and headlights all at the same time with a 63a alt, at idle you would be running off your batt. But now with the 100a back in, all is well. Thanks for your guys' help.
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