post #1 of Old 07-06-2013, 06:29 PM Thread Starter
davidtownsend
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What is the specs on this alternator?

I got this at the junk yards while back and I told the guy I needed a 5.9 alternator. He came from the back with this one and I couldn't find any specs online but I'm using my phone so maybe someone on here can help me out. Here is a pic of the sticker with the numbers on it. Thanks for the help!

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1994 Jeep Grand Cherokee 5.2L Limited
2006 Jeep Grand Cherokee Overland 5.7L Hemi
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post #2 of Old 07-06-2013, 06:48 PM
WhiteOut
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121000-3470 comes back as 90AMP alt.

-4170 and -4171 are 136 amp from the 5.2 or 5.9
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post #3 of Old 07-06-2013, 07:04 PM Thread Starter
davidtownsend
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121000-3470 comes back as 90AMP alt.
Thanks man! I should have known they didn't have one. I have one more question. I got a almost new alternator from the jy and it has a bigger pulley on it. I looked at the one on my zj and it had a smaller pulley on it. They are both 7 grooves but the diameters are different the one I have on is smaller and the junk yard alternator. Would the alternator with the smaller diameter spin faster?

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post #4 of Old 07-06-2013, 07:06 PM
WhiteOut
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If they are both the same number of grooves you should be ok. You'll need an impact to get the pulley off though.
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post #5 of Old 07-06-2013, 07:12 PM Thread Starter
davidtownsend
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I just want the most RPMs out of the alternator as possible.

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post #6 of Old 07-06-2013, 08:06 PM
5-90
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I just want the most RPMs out of the alternator as possible.
What do you mean? The alternator's a generator, not a motor. You can hook it up all you want, she won't spin...

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post #7 of Old 07-06-2013, 08:20 PM Thread Starter
davidtownsend
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The faster the alternator spins the more juice it produces right?

1994 Jeep Grand Cherokee 5.2L Limited
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post #8 of Old 07-07-2013, 07:32 AM
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Originally Posted by 5-90 View Post
What do you mean? The alternator's a generator, not a motor. You can hook it up all you want, she won't spin...

"You can't get what you want until you know what you want."
i think he means he wants to put a smaller size pulley on the alternator to make it spin faster when the engine is running
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post #9 of Old 07-07-2013, 07:49 AM Thread Starter
davidtownsend
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Originally Posted by AmishFury View Post

i think he means he wants to put a smaller size pulley on the alternator to make it spin faster when the engine is running
Yes! Will it spin faster with the smaller one?

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post #10 of Old 07-07-2013, 08:12 AM
dylantheheeler
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Yes it will.


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post #11 of Old 07-07-2013, 12:35 PM Thread Starter
davidtownsend
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Awesome! Thank you guys for the help.

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