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Old 09-03-2009, 05:46 PM   #1
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High Output Alternator Question

If I install a high output alternator (approx. 200 amps peak output), will I need to install a heavier cable from the alternator to the battery? Most of the aftermarket alternators I have been reading about claim they have electronics that will protect the jeep's electrical systems.
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Old 09-03-2009, 06:18 PM   #2
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A heavier cable between the 200 amp alternator and battery would be good but understand that the alternator would RARELY, if ever, actually be called upon to actually produce its full potential 200 amps. If the electrical system is drawing 25 amps, an alternator will only put out 25 amps whether it is a 200 amp alternator or 117 amp alternator. 200 amps is just its max capacity that it may never actually be called on to produce.

The Jeep's electrical system needs no other protection against the bigger alternator's greater potential. A larger capacity alternator doesn't/can't force additional amps through the rest of the circuits. For example, if your radio draws 3 amps, a 200 amp alternator won't affect or change that radio's continued draw of 3 amps.

The 200 amps would only potentially happen when the battery is getting drawn down heavily by a long extended heavy winching operation. Otherwise it'll put out the same exact amps 99.99% of the time that your current alternator does.

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Old 09-03-2009, 06:34 PM   #3
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Terrific, that is what I was hoping someone would tell me. I have a Warn 8000 winch, HID lamps (x2) and OBA. Haven't tried to tackle the double battery idea, but that will be next. Just made a great trade for a new mean green alternator and want to install asap. wanted to make sure I wasn't gonna screw up a good thing.
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Old 09-25-2009, 01:08 PM   #4
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I just bought a Mean Grean High Output alternator too for my 04 TJ 6 cyl. Going to install it next week. I do alot of winching so I wanted a good strong electrical system.

I've already got the upgraded wiring. Now I just need a new battery. The Gel battery I bought from Napa is dead and refuses to take and hold a charge. I may try charging it again at 2 amps for 4 hrs to see if that does the trick. Thats advice I got from a local shop owner. If that doesn't work I guess I'll give the yellow optima a try.
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Old 09-25-2009, 08:03 PM   #5
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is that mean green alternator bigger than the stock one? if not it will not fit beside the ARB snorkel hose beside the air box.

youŽll like the optima YT.
when i rolled up my winch line without load with the stock battery the gauge went down to 10.5-11V. with the optima it stays always above 12.5V.
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Old 09-25-2009, 08:47 PM   #6
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Quote:
Originally Posted by ygohome View Post
The Gel battery I bought from Napa is dead and refuses to take and hold a charge.
What gel battery? None of the batteries commonly used in Jeeps are gel cell batteries, they are often AGM (absorbed glass matting) though. Optima is not a gel cell battery, neither is an Odyssey, NAPA, Diehard Platinum, Exide Orbital, nor any of the ProComp batteries.

Gel cell batteries are incapable of being charged with high amperages, neither are they capable of providing high amperages. Only a very few small cars use them that have special charging systems designed for gel cell batteries.

Since Optima's quality took a nose-dive, the current favorite high-end AGM battery is either the Odyssey or Sears Diehard Platinum which is made for them by Odyssey. After three Optima battery failures (two yellows and one blue) in 8 or so years, no more Optimas for me. After switching to the Diehard Platinum 34-78DT a month ago, the engine even spins over significantly faster during startup than it ever did with my three previous Optimas.
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Old 09-25-2009, 09:01 PM   #7
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I'm sorry... it is not a gel battery but an AGM.

The one I have from Napa is an Exide marine battery and actually has pretty good stats. But for some reason won't hold a charge.

Exide Technologies Orbital Deep Cycle

I'll give that Sears Diehard Platinum a try. Going to google it to find out more about it. I was very impressed with they Odyssey and was going to get one but in the end I got that exide because I happened to be at Napa one day and just went for it. I should have stuck with my first choice.

Thanks,

Ben
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Old 09-25-2009, 09:11 PM   #8
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Quote:
Originally Posted by nicolas-eric View Post
is that mean green alternator bigger than the stock one? if not it will not fit beside the ARB snorkel hose beside the air box.

youŽll like the optima YT.
when i rolled up my winch line without load with the stock battery the gauge went down to 10.5-11V. with the optima it stays always above 12.5V.
they are the same size... uses the stock mounting position. litterally takes 5 minutes to swap them according to their website.

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Old 09-25-2009, 09:54 PM   #9
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yeah 5 min if you rush through it, 20 if you do like the rest of us and enjoy a nice cold brew while working.
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Old 11-15-2011, 12:16 PM   #10
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I Know this is an older thread, but I have been looking into the alternator upgrade and thought I should share what I have found...

Auto zone has a 160amp alternator (from a 2001 Dodge Durango, the smaller V8 alternator is the one you will need) With a lifetime warranty for $150.

Mean grean is 200 to 220amp for $400 with only a one year warranty...

I am going with the lifetime warranty, 40 less amps, and saving $250.

What did you guys do for the wire upgrade? size, inline fuse, etc..
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Old 11-15-2011, 02:15 PM   #11
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Quote:
Originally Posted by Thrasymachus View Post
I Know this is an older thread, but I have been looking into the alternator upgrade and thought I should share what I have found...

Auto zone has a 160amp alternator (from a 2001 Dodge Durango, the smaller V8 alternator is the one you will need) With a lifetime warranty for $150.

Mean grean is 200 to 220amp for $400 with only a one year warranty...

I am going with the lifetime warranty, 40 less amps, and saving $250.

What did you guys do for the wire upgrade? size, inline fuse, etc..
Keep in mind that all of the automotive box store starter motors and alternators are remanufactured failures. Mean Green may or may not be, and they may or may not have tighter testing tolerances than the box stores. But the $150 sticker and lifetime warranty from Autozone is probably because it only costs them $10 to spray some WD-40 into the last returned failure and give it to you...
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Old 11-16-2011, 08:25 AM   #12
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I have a Mean Green in my 89 YJ. I also have a redtop Optima. It also has 7" HID's, stereo we play all the time and we do a lot of winching in the woods. Never had had any sort of problem at all. Volt meter is always over 12v.
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Old 11-16-2011, 04:14 PM   #13
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Installed the Mean Green in my TJ a few Months ago and everything is Good.

I've Loaded it Down with all my Lights on at Idle, and the Voltage never even Moved from 13.8v

You could Hear the Tone of the Engine / Alternator Change, as the Load was Applied, but that was about it.

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