Rebuild Alternator To Higher Amp Output?

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Forum Name: General Discussion
Forum Discription: General Mobile Electronics Questions and Answers
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=98181
Printed Date: May 09, 2025 at 1:02 PM

Topic: Rebuild Alternator To Higher Amp Output?

Posted By: profuse007
Subject: Rebuild Alternator To Higher Amp Output?
Date Posted: October 21, 2007 at 8:07 PM

Rebuild alternator to higher AMP?

I am curious to what it takes to get it built to output more current.

Please share.

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Replies:

Posted By: mcdonald2000
Date Posted: October 24, 2007 at 1:35 AM

Check out these guys, maybe they can help you. https://www.smithae.com/cando.html?OVRAW=%22alternator%22%20rewind%20or%20rebuild&OVKEY=alternator%20rebuild&OVMTC=advanced&OVADID=4546717512&OVKWID=50298581512

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1 ohm

Posted By: profuse007
Date Posted: October 25, 2007 at 9:29 AM

Heres an article on How-To rebuild

As it seems, all they do is replace the:

1. Rectifier
2. Diode
3. Voltage Regulator and Brush Assembly

As far as knowing what will generator more current, I am clueless. Thats where some of the Electrical Egr can jump in and explain.
posted_image

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: profuse007
Date Posted: October 25, 2007 at 9:44 AM

Heres another article on theories behind alternator

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: haemphyst
Date Posted: October 26, 2007 at 1:40 PM

I personally would NEVER rebuild or rewire...

Why? What happens if your rebuild or rewire fails for some reason on Friday night of a 4 day weekend? Parts houses are all closed for four days. You're stuck with no car.

Buy an aftermarket or rewound HO alternator. More expensive, sure, but the security is worth every penny...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: profuse007
Date Posted: October 29, 2007 at 1:02 PM

You're kidding, right?

Anyways, after spoken to a guy that rebuild alternators, you will have to upgrade the stator but youre limited to the area of the alternator casing. The gain isnt that significant, 20-30A but teh cost will be more than getting a secondary battery. The best bet is to get a larger casing alternator from GM or Ford and have it built up to 200A or more.

However, there is still hope. There are couple of site that sell you the raw parts and you can mix put it together yourself.

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Houston,TX
"The two most common elements in the universe are H+ and stupidity" (Ellison).

Posted By: boogeyman
Date Posted: November 23, 2007 at 11:25 AM

imo your best bet is to purchase an aftermarket alternater ..more reliable and comes with a warrenty.....good to see you looking into upgrading your alternator as it is one of the most important factors in car audio but the moost seldom overlooked aspect of car audio..

Posted By: haemphyst
Date Posted: November 26, 2007 at 9:10 AM

profuse007 wrote:

You're kidding, right?

Who's kidding... About what? Me? About actually buying an HO replacement? No... I'm not kidding, because I've SEEN that very situation happen!

profuse007 wrote:

Anyways, after spoken to a guy that rebuild alternators, you will have to upgrade the stator but youre limited to the area of the alternator casing. The gain isnt that significant, 20-30A but teh cost will be more than getting a secondary battery. The best bet is to get a larger casing alternator from GM or Ford and have it built up to 200A or more.

Your guy has no idea what he's talking about! Yes, the stator must be bigger, but it must be rewound with heavier gauge wire as well. I have an HO alternator in my Civic that is rated 200A cold, and 170A+ hot. This from an IDENTICAL OEM case, that came from Honda with a 65A/55A rating. The stator is thicker, but also wound with FAR heavier wire than was the OEM piece, but over THREE TIMES the OEM current rating! It can be done, but there is more to it than just putting in a bigger stator! (And a second battery won't help one little bit... It's only going to axacerbate the problem!)

profuse007 wrote:

However, there is still hope. There are couple of site that sell you the raw parts and you can mix put it together yourself.

I still recommend STRONGLY replacing the alternator with another, as opposed to rebilding or re-wiring... 200 dollars to rebuild, and 350 to replace... No contest for me!

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."