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Old 10-12-2013, 02:20 AM   #1
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H/O alternator

Anyone running a high output alternator on their Jeep? I have a 200 amp Mean Green alternator on my truck along with dual batteries & 4ga cables feeding everything. The HO alternator is one of the best upgrades I have yet to do to the truck.

I have a total of 14 additional strategically placed lights on the truck, 2 fogs & 4 hellas on the wincher, 4 rear facing back up lights & 4 rock lights under the truck. Plus a 12k winch. The stock 100 amp alternator wasn't cutting it.

I'm not gonna light up the Jeep like I did the truck, but I'll for sure have a winch & some windshield mount Hellas as well as some rear facing lights.

How does the stock alternator on the YJ's handle the extra load?

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Old 10-12-2013, 03:29 AM   #2
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My 07 JK came with a 160 amp one.

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Old 10-12-2013, 03:32 AM   #3
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Wow. That's pretty beefy for a factory setup. I guess auto makers have finally learned that puny 90 amp alternators won't cut the mustard in the real world. I have a restored 71 F-100 that came with a 60 amp from the factory. The high beams put it in a bind....
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Old 10-12-2013, 07:53 AM   #4
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no doubt that with your setup you need a high output setup.However,many high output alternators use the same housing and cooling that the low output alternators use.This makes them run hotter and cuts their life expectency.So,if you need it get it but if you don't,the low output will probably last longer
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Old 10-19-2013, 11:01 AM   #5
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So do all the JKs have the 160 Amp Alternator?

What about running a Winch? Do the JKs need to upgrade the electrical system? Or is it enough to handle occasional Winch use?
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Old 10-19-2013, 08:01 PM   #6
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Originally Posted by W5KVV View Post
I have a total of 14 additional strategically placed lights on the truck, 2 fogs & 4 hellas on the wincher, 4 rear facing back up lights & 4 rock lights under the truck. Plus a 12k winch. The stock 100 amp alternator wasn't cutting it.
Wow, you scared of the dark or something
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Old 10-19-2013, 10:27 PM   #7
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Old 10-20-2013, 12:17 AM   #8
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lol. You guys. We do a lot of night time wheeling/exploration around here. If there's one thing I learned about night-ops it's that you can never have too much light.

The guys at work call my truck the mobile light house. The YJ is going to have 4 front & 2 rear facing aux lights. I don't think there will be a need for rock lights, but they come in handy for other uses. Changing a flat at night in the middle of nowhere with rock lights is great.
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Old 10-20-2013, 02:59 AM   #9
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So do all the JKs have the 160 Amp Alternator?

What about running a Winch? Do the JKs need to upgrade the electrical system? Or is it enough to handle occasional Winch use?
No only the 2007. 2008 and up have the 140 amp one.
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Old 10-20-2013, 09:59 AM   #10
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For TJ's you can fit an alternator from a durango(160a maybe?) for a cheap boost. Don't know if it's possible for YJs
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Old 10-20-2013, 10:32 AM   #11
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For TJ's you can fit an alternator from a durango(160a maybe?) for a cheap boost. Don't know if it's possible for YJs
I think I heard of a Dakota swap along the way... somewhere... lemmie looky around.
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Old 10-20-2013, 10:49 AM   #12
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Be careful if you go too much higher than what the original is rated at. Years ago, I remember a co-worker who thought he would save some money buy "borrowing" a police vehicle alternator off the assembly line where we worked and install it in his pickup truck, which needed a new alternator.

Not long after that much of the main wire harness had to be replaced because the H/O alternator overloaded the system. I think his free alternator ended up costing him around $1,000.
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Old 10-20-2013, 11:05 AM   #13
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I think I heard of a Dakota swap along the way... somewhere... lemmie looky around.
These are supposed to be direct replacements, I think the 136 is a 95-98 GC alternator.
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136A
It's part number 13387 at Advanceautoparts.
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160 amp alternator*:

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2001-2005 Dodge B.Series Van - (PN:56029914AA Reman:R6029914AA)
I haven't swapped mine, so I cannot say 100%.
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Old 10-20-2013, 11:10 AM   #14
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If you want an H/O alternator to try and keep up with your winch then don't waste your money. There's no alternator out there than keep up with a winch. It might get you a couple more minutes of winching before you kill the battery.

The stock alternator should be perfectly fine keeping up with some aux lights. For winching upgrading to a quality battery will do you more good.
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Old 10-20-2013, 12:32 PM   #15
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I am running a 205 amp alt. in my 97 SE, I needed a new alt several years ago and this was my upgrade. It never struggles with lights or my 1000w. inverter. I just had to upgrade the main cable to the battery at the same time.

alternator, amp items in alterstart store on eBay!
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Old 10-21-2013, 09:23 AM   #16
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I love the 200 amp alt on my truck. It works like a charm. freeskier you are correct, no alternaor on earth will keep up with a winch under load. The 12K winch on my truck draws 600+ amps under full load. But a 200 amp alt & dual 1250CCA bateries sure helps.

I figure the stock alt on the YJ will be fine for now. Like I said, I don't plan on lighting it up like the truck. If I do, I might try some LED's this go around.

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