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Old 01-12-2008, 04:42 PM   #1
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alternator upgrade question

ok so I went to a used parts scrap yard today and picked up my new (used) 1999 dodge ram 136A alternator to replace the stock 90A I have in the TJ right now. Before I get too far into this I remember someone saying that I should upgrade the stock positive battery cable to a bigger gauge.

So I have a few questions:
1. What gauge should I go with?
2. How long does it need to be?
3. Are there any splits in the cable or is it just one straight line to and from the battery and alternator?
4. Is there anything I can use to safely clean the new alternator with to get all the dirt and crap off it? like brakeleen or some sort of engine scrub?

Thanks for the help.
Fox

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Old 01-12-2008, 06:38 PM   #2
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I wouldn't worry about it. VERY rarely will the alternator be putting even close to the 136 amps it is capable of. The only time it might is when the battery was completely drained and the alternator was recharging it. The OE charge wire is more than capable of that much load, which is not that much more than the 117 amp alternator that is more commonly found in the TJ which uses the same battery connector.

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Old 01-12-2008, 06:56 PM   #3
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Try cleaning it with compressed air to get the crap out of all the slots.
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Old 01-12-2008, 07:02 PM   #4
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how easy is it to install the dodge alternator? do you have to modify the mounts?

Quote:
Originally Posted by Jerry Bransford View Post
...the 117 amp alternator that is more commonly found in the TJ...
how can i see which alternator i have?

are the stock cables strong enough for a 200A alternator?
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Old 01-12-2008, 07:12 PM   #5
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Quote:
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how easy is it to install the dodge alternator? do you have to modify the mounts?
?
no mount modification necessary, they are the same mounts used in the TJ's the only difference is the pully, it has 6 or 7 ribs compared to the 5 or 6 the TJ has. just make sure its from a 1999 5.9L dodge ram/PU.
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Old 01-12-2008, 07:21 PM   #6
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Old 01-12-2008, 07:24 PM   #7
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x2 ^^

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Old 01-12-2008, 07:30 PM   #8
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lol where do you find those things Nico? lol



wait wait wait is that osama there w/ a hair cut?
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Old 01-12-2008, 07:37 PM   #9
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sorry fox for that much OT in your thread...
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Old 01-13-2008, 09:36 PM   #10
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x2 ^^

lol its all good. I will get pictures done when it stops raining and I have time to put it in. later this week I'm hoping
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Old 01-14-2008, 06:47 AM   #11
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I did the same swap but it does not have to be a 99 dodge, mine was from a 94 dakota and my buddies was a 95 ram. I didn't swap out the power cable and it works just fine! Sorry no pics, but try this.....stare at your stock alternator then pretend it's from a dodge.....
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Old 01-14-2008, 08:16 AM   #12
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I did the same swap but it does not have to be a 99 dodge, mine was from a 94 dakota and my buddies was a 95 ram. I didn't swap out the power cable and it works just fine! Sorry no pics, but try this.....stare at your stock alternator then pretend it's from a dodge.....
well for those of us who are imagination impaired I post pics of when I do the install
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Old 01-14-2008, 09:36 AM   #13
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Quote:
Originally Posted by nicolas-eric View Post
are the stock cables strong enough for a 200A alternator?
I'd replace the charging cable between the alternator and battery for a 200a charger.

So far as how to tell if you have a 117 amp alternator, I can't say but if your TJ came with a/c or was otherwise well equipped, it likely has a 117 amp alternator. Only stripped down TJs came with the smaller alternator.
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Old 01-17-2008, 09:12 PM   #14
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Ok guys, for all that are wondering on how the install went here it is!!!

I first went to the local used parts store (AKA: U-pull it) and picked myself up a 1999 dodge ram 136A alternator.

First picture is of the stock alt before it was taken out.

second picture is of the repacement I was putting in place of the stock one.

Later after I took the stock one out I found out that I actually needed one from a 1998 year vehicle, so after taking the '99 back and getting the '98 I was good to go. the difference was that the 99 had a plug style connector different than the nut connector I had on mine (as seen in picture three). sorry I didn't take a pic of the plug style.

the fourth picture is when I decided to take the extra minute or two to swap the pullys between the different Alt's. the stock one had one less ribs on the pully than the replacement so to be on the safe side I took the impact gun to it.

Fifth picture is of the difference between the two pullys.
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Old 01-17-2008, 09:19 PM   #15
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picture six of the two alts after the pully swap and compairing the sizes of the two alts.

7 is of the hole where the stock one was and the new one will go.

before I could put the new one in there was a spacer on the top hanger that both alt's had but the new one was just a little too close, close enough that I couldn't get it mounted on the engine. so with a little help from my BFH and a punch I knocked it back just enough so that I could mount it on the engine.

last picture is of the new alt in its place and all ready to go.

pretty easy install didn't take very long at all. two bolts keeping the alt on the engine (top and bottom) one nut keeping the battery lead on the alt and about 4 more on the connector at the bottom of the alt. Any questions?
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Old 01-17-2008, 09:32 PM   #16
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can you remove the pulley wheels without an impact wrench?
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Old 01-17-2008, 09:38 PM   #17
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I think it would be kinda hard due to the alt spinnin around and nothing for you to grab onto. you can run the other pully with the extra rib but I really didn't feel like doin that...and I like tearin shit apart.

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