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Old 03-28-2016, 07:27 AM
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Broken alternator bracket and the eBay alternative replacement fix

Recently during an inspection for some battery related issues on my 2.5 cyl, I noticed my alternator bottom bracket along with the alternator arm have completely sheared off. It looks like it has been this away for awhile. Apparently, this is quite common on the TJs from what I've researched.

I found out that this OEM bracket is no longer available so the junkyard or eBay would be my only choice. I found a guy on eBay that fabricated this bracket out of billet aluminum for $50, which was the going rate for a used OEM bracket.
Once received, it looks to be well fabricated and much heavier than the cheap OEM potted metal. The holes were already threaded to reuse the OEM bolts. I did have to buy another bottom bolt which for reference, is a M10x1.5x55 grade 8 at home depot.

The new bracket does not use the rear bolt from the supporting bracket and really does not need it due to the superior strength of the new bracket. I had a spare alternator from a local Jeeper. Install was straightforward on the roomy 2.5cyl and result was very satisfactory.

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Old 03-28-2016, 10:16 AM   #2
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Nice find, wonder if he makes one for the 4.0l.
Mine was broken and PO apparently tried JB weld. I replaced with a junkyard pull, cracked again after a couple years.
Found the bracket had a bit of play when the alt bolted in the top.

The last bracket I put on, I added a washer where the play was at the top, no issues since.

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Old 04-18-2016, 10:24 PM   #3
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can you post the link to his ebay store? the alternator on my wife's cheap seized up and i noticed the bracket was corroded and already broke when i pulled it off... ugh!
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Old 04-19-2016, 07:35 AM
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Old 04-19-2016, 09:47 AM   #5
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Thank you!!
The 2.5l and 4.0l have different brackets, correct? My buddy has one I can have from his 4.0l....
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Old 04-19-2016, 05:53 PM   #6
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Quote:
Originally Posted by richiemoe View Post
Thank you!!
The 2.5l and 4.0l have different brackets, correct? My buddy has one I can have from his 4.0l....
Pretty sure the brackets are different.
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Old 04-20-2016, 11:43 AM   #7
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Pretty sure the brackets are different.
I checked around and it looks like they are different, so I ordered one of the billet aluminum ones on that ebay link. Thanks again!
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Old 04-20-2016, 02:35 PM
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Thank you!!
The 2.5l and 4.0l have different brackets, correct? My buddy has one I can have from his 4.0l....
I would definitely give the 4.0 bracket a try because although it's visually different in design, the 2.5 bracket has a separate metal rear support bracket but it looks like the 4.0 bracket was design to eliminate the bracket but still have the same mounting holes into the motor. Definitely worth a shot before you order the eBay one.

You can see that metal support piece in my second pic.
Here's a web 4.0 pic:
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Old 06-01-2016, 08:41 AM   #9
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I ended up buying the billet one on ebay. As an FYI to anyone else who buys it, I had to attach it to the alternator first, then to the block. For what ever reason, it wouldn't align up that makes sense, when you take off the old one. But it works great and I am definitely happy I purchased it. But then it started leaking coolant the next week and I had another project... haha

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