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mudsling 10-06-2012 06:13 PM

Alternator upgrade success!
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I want to thank you guys in the know for all of the good information provided in this forum. I have a 94YJ 2.5L. I have KC lights, winch, stereo, etc. I research for the best way to up grade the original alternator in my jeep, this is what I came up with, with you guys help of course.

First I bought a Diehard P2 $240, which fits perfectly on the YJ battery Tray. I bough a 25' roll of welding wire #2 ($50), cable lugs. I re-wire all of my negative and positive cables, example: battery (-) to motor and battery (-) to fire wall. Battery (+) to starter, battery (+) to PDC.

Alt I bought at Autozone for a Jeep Grand Cherokee 136amp $130. Direct fit. Disconnected the 6 gage ground wire going to the engine and replace it with #2 welding wire. The positive side I ran to a 150 amp ANL fuse and fuse holder then to battery positive.

On a side note, you may wonder about the cut out fenders, I am waiting for a set of tube fenders from C & C Fabrication.

Did a test run. Hooked up to my dump truck from the bottom of my drive way, all lights on, stereo on, on idle I winched myself to the top (I would not do this on a real winching situation). No sweat.:2thumbsup:

Thanks guys

Eron 10-06-2012 06:24 PM

Very nice indeed. Ive been looking to do a swap like this as well. Do you know if the same alt will work on the 4.2? Id like to assume it does. But you know what they say about that.

Anticanman 10-06-2012 06:40 PM

Nice. Which write up did you use?

mudsling 10-06-2012 06:43 PM

There is a list on this site, it will tell you what alt fits on the 4.0L.

dillonjm 10-06-2012 11:13 PM

Very nice, I did the same upgrade a while back. Its nice to not have to worry about running accessories.

Michaelgoesrawr 10-07-2012 12:04 AM


Originally Posted by Anticanman (Post 14264528)
Nice. Which write up did you use?

This. I've been looking into upgrading but haven't found anything that's much help

Anticanman 10-07-2012 12:06 AM

There are quite a few threads like this:

I was just hoping he would give credit to the specific author.

Michaelgoesrawr 10-07-2012 12:17 AM


Originally Posted by Anticanman (Post 14265497)
There are quite a few threads like this:

I was just hoping he would give credit to the specific author.

Thanks. I forgot about that one. It's a good write up although I would've liked if he went into the wires with more detail.

mudsling 10-07-2012 02:02 AM

It took me a little while to get the concept, to make sure I was somewhat competent for undertaking this upgrade. I read and I read and re-read. Everything I found on "alt upgrade," but un-functionally was either for the 6cyl or it was never complete explanation of the process, for example: What was the correct way to go from alt to battery. For me this was the one thing that took me the longest to get. Now, I am no expert but it became clear to me that this wire needed to be bigger than stock and had to have its own fuse.

Originally I tried to install the 160 amp (Dodge Dakota PN 56029914AA) But had a plug in for the stator wire and other wire. I did not wanted to rig this connection. So I went with the 136 amp (life-time warrantie) from a 98 Grand Cherokee 318 5.2L. Perfect fit. I did't have to do anything with the plastic shield, it was facing the right way. The reason I went with the Autozone Alt is that, there was an alt at the Junk Yard. They wanted $75 bucks. But I reasoned, why get cheat and adventurous at this point. I have sank so much money and labor into my Jeep that another $130 won"t make a difference, and also the peace of mind.

JohnMurphy 10-07-2012 03:34 AM

That sears Diehard P2 LOOKS BEAUTIFUL!! I just got the P4 and so far I love it. I also am going to get a new alternator. I have already upgraded the wires. I was gonna go to a 120 AMP I think. Again, congratulations it looks nice in the pics GOOD JOB!!!:cheers:

mudsling 10-07-2012 07:58 AM

Anticanman, I read many treads, by no means I take any credit. Sorry for not having all of the authors name. One that I used was 5-90, hope I got his user name right. I do apologize.

mudsling 10-07-2012 08:24 AM

Johnmurphy, I love that 930 cca. I had the P4 also but decided to upgrade to P2, more cranking amps. Btw, gave my P2 to my girlfriend, she has 87 YJ.

dillonjm 10-07-2012 09:54 AM


Originally Posted by mudsling (Post 14264428)

On a side note, you may wonder about the cut out fenders, I am waiting for a set of tube fenders from C & C Fabrication.

They are nice fenders.

I think you'll like them. Plus its nice to support a smaller fab shop when you can. I went to their place to pick them up in Glendale, seemed like a nice operation they had going.

JohnMurphy 10-07-2012 02:35 PM

Mudsling..I wanted to get the P2 but sears said it would be a while before they got more in,so I just got the P4. Probably a sales trick. I run lights so I just hooked them up to the other posts. It worked out.If you have a girlfriend that has a 1987 YJ and she INTO jeeps....You need to turn said girlfreind nto a wife!!!! LOL!!!
Again.....GREAT JOB on upgrade!!

mudsling 10-07-2012 09:10 PM

Dillonjm, those tube fenders look great. I spoke to Chris (c & c fab), he took the time to answer my questions, real pleasant guy. I also order a rear bumper from Dirtyworx, I will be building the tire carrier myself. I will post pics when I am done.

The time now is 07:22 AM.

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