120a vs. 94a Alternator - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 04-28-2000, 09:38 PM
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120a vs. 94a Alternator

Autozone has the 94 amp alternator w/ lifetime warranty for $99 thirty dollar core.
Alternator shop can rebuild my 63 amp to 120 amp for $96.
I'll be running a winch (Warn 8000lb.), normal radio, CB, electric fan, and a couple pairs of lights. Fan and winch will be the only extras for right now. So, do I go bigger or lifetime warranty? The shop will stand by it while I'm here but I'm military so will be gone before long. Can I pass off my 63 amp alternator for the 94 amp core? The core for the 94 amp is $30 vs. $15 for my 63 amp.

Can you fix it?
I got a welder and a grinder. Heck yeah I can fix it.[img]/wwwthreads_images/icons/cool.gif[/img]
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post #2 of (permalink) Old 04-29-2000, 12:29 AM
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Re: 120a vs. 94a Alternator

To turn a 63 amp into a 120 amp, you will have to change every single part of the alternator, Including the case.
Sounds like the guy at the shop is trying to pull a fast one...

63 amp Delco is a regular, normal, low performance 10-SI case.
He will have to go to at lest a 12-SI cast to even fit the regulator in...
The 120 amp rotor has longer bearing surfaces, and the 12-SI case has longer bearing gussets to accommodate the bigger bearings required.
The 120 amp rectifier bridge will not fit into the 10-SI case no matter what you do...

If he is using one of the so called, 'Up Grade' kits, the alternator will not last very long, and god help you if you have voltage sensitive electronic equipment on board, like CB radios or stereos...
Those upgrade kits don't control voltage spikes worth a hoot...

If you really want to upgrade, get a 130 or 160 Amp Leese-Neville off of a wrecked big truck.
They aren't much bigger than your current alternator, and is a continuous duty cycle rated, not just surge...

Good luck on what ever you decide...

"I Have The Body Of A God... Buddha"
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post #3 of (permalink) Old 04-29-2000, 08:02 AM
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Re: 120a vs. 94a Alternator


First, let me thank you for helping all of us who are electrically illiterate. I'm a wiz at computers and math, but like others on this board, could possibly have an eletrical learing disability.

Since I'll be in the market for a higher output alternator after finals, when I will finally get my Jeep running. I am wondering with the big-rig alternator, if I got one how would I be able to have surge protection. I like the idea of having one of Leese-Neville, weren't they supposto last 300,000 miles or so?


<font color=blue>engine rebuild w/4.0 head done, now for the MPI</font color=blue>
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post #4 of (permalink) Old 04-29-2000, 11:19 AM
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Re: 120a vs. 94a Alternator

[img]/wwwthreads_images/icons/smile.gif[/img] There are probably Leece-Neville alternators out there with a lot more miles than that. I make it a point to "bench" the alternator every 100K...changing the brgs and so forth, and I always do it to MY alternator not get a rebuilt. On our CJ, we are using a GM Delco that came from one of my Olds Diesels...two batteries...glow plugs....A/C....they used the high-output GM alternators.[img]/wwwthreads_images/icons/wink.gif[/img]

Quadra-Trac modified by the crack moonguy[img]/wwwthreads_images/icons/wink.gif[/img][img]/wwwthreads_images/icons/smile.gif[/img][img]/wwwthreads_images/icons/tongue.gif[/img] transfer case team.
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post #5 of (permalink) Old 04-29-2000, 11:04 PM
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Re: 120a vs. 94a Alternator

I agree.
Just buy a high output alternator for something like a big Cadillac or Full Size Buick with power everything...
Those should be enough for anything stock...
The Leese-Neville is overkill, but I have several lying around, and I can get brand new ones from the Heavy Truck discount houses for about $100 outright... Too cheap to pass up for an industrial unit...
The deed is done, and you NEVER have to worry about it again...

"I Have The Body Of A God... Buddha"
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