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Unread 03-23-2013, 11:56 PM   #1
HiDefXJ
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Another high output alternator quesrion....

Help!
Just hooked up 4 of the 7 Offroad lights on my 2k xj and my rpm`s drop slightly when i turn em on (150 watts/each). I shudder to think what will happen to my stock alternator when I add the remaining 3 lights.
I have searched and searched and I have seen everything from upgrading the ground and pos wire to adding a battery or going with a Durango alternator, Also spending $500 for a H.O. alternator!
IS THERE AN EASY CHEAP-ISH SOLUTION?
I just want an inexpensive alternator that drops in without a lot of modification or high cost! Is there such a beast?
Other cheap/easy solutions?

Thanks everyone!

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Unread 03-24-2013, 12:04 AM   #2
Hudson
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Quote:
Originally Posted by HiDefXJ View Post
Help!
Just hooked up 4 of the 7 Offroad lights on my 2k xj and my rpm`s drop slightly when i turn em on (150 watts/each). I shudder to think what will happen to my stock alternator when I add the remaining 3 lights.
I have searched and searched and I have seen everything from upgrading the ground and pos wire to adding a battery or going with a Durango alternator, Also spending $500 for a H.O. alternator!
IS THERE AN EASY CHEAP-ISH SOLUTION?
I just want an inexpensive alternator that drops in without a lot of modification or high cost! Is there such a beast?
Other cheap/easy solutions?

Thanks everyone!
Search "ZJ To XJ Alternator Mod".

The ZJ alternator is 130 amps stock, and your XJ is probably 90. Requires a little grinding, but it does fit in. You should be able to find a thread on it.
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Unread 03-24-2013, 02:54 AM   #3
biztyke
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Quote:
Originally Posted by Hudson View Post
Search "ZJ To XJ Alternator Mod".

The ZJ alternator is 130 amps stock, and your XJ is probably 90. Requires a little grinding, but it does fit in. You should be able to find a thread on it.
hes got a 2000, i thought 00-01 had 117 amp alts stock. not worth the effort for only 13 more amps.
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Unread 03-24-2013, 08:38 AM   #4
RockRodHooligan
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Unread 03-24-2013, 10:36 AM   #5
HiDefXJ
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Quote:
Originally Posted by RockRodHooligan View Post
Seems to me this guy had the same issue and did a temporary swap while he rebuilt his current unit.
Mine may very well need to be rebuilt/replaced, but I'm trying to find out which one I need.
I can swap housings or grind brackets but I need more amperage than stock.
Is my only alternative a $400-$500 unit?

Thanks for the replies so far!
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Unread 03-24-2013, 10:44 AM   #6
cory4um
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What's wrong with a junkyard unit?
160a can be found easily in lots of dodge/jeep applications.

Best 20$ i spent.

Grinding was easy with a dremel.
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Unread 03-24-2013, 11:51 AM   #7
HiDefXJ
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Quote:
Originally Posted by cory4um View Post
What's wrong with a junkyard unit?
160a can be found easily in lots of dodge/jeep applications.

Best 20$ i spent.

Grinding was easy with a dremel.
I have no prob with that but I need to know what year/model to use.
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Unread 03-24-2013, 12:06 PM   #8
Charley3
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Wouldn't 3 offroad lights be more than enough over kill?

TJ Rubicon alternators are 130 amp. Mine was test and put 140 amps.

Not sure, but maybe regualar TJ do too.

Someone else posted ZJ do.

And some dodge trucks and Durango have even stronger alternators that are bolt on mods.

All those are affordable and easy ideas. Go to a U-Pull It junkyard and price will be good.
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Unread 03-24-2013, 01:00 PM   #9
HiDefXJ
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I really can't believe that no one has locked this down yet.
I have read soooo many articles about this and there is no definitive answer.
Some say mean green, some say upgrade supply wiring, diodes, larger fuses. Some say just toss in a Durango alternator. Some say a TJ alternator.
Double batteries, swapping housings.
I'm going craaaaaazy!
I hate to do double work. Like I said before, I will do the work and grind or swap housings, I don't care! I just don't want to do it if it's not gonna last or it's gonna burn up something.
Help Guys!
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Unread 03-24-2013, 05:15 PM   #10
Charley3
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Aftermarket alternators are typically to expensive, and not much, if any, better than Durango alternator. Aftermarket alternators might be less reliable than a Durango.

The Durango is affordable and plenty powerful. I forgot how much power they make, but it's respectable and affordable. More powerful than TJ Rubi alternator and probably same or less money.

Here is what I would do (if I wanted a ridiculous amount of lights):

Durango alternator and a Group 65 Sears Diehard Platinum battery.

Get a Sears Diehard Platinum Group 65 battery. That is a Ford Super Duty battery (BIG). It is the largest battery you can use without major mods. It does require minor grinding on batter tray to get it to fit, but no big deal.

My cousin put one in his 98 XJ and I had one in my 2006 Wrangler Rubi. He says it is easier to put in an XJ than a TJ.

The Diehard Platinum are the most powerful per size, and Group 65 is largest size that can fit. A group 65 costs same as stock size battery, and is much cheaper than a dual battery set up.

The Diehard Platinum has better cold cranking power than a Red Top, and better deep cycle than a yellow top.

Do those two things and you'll be set, or well on your way, for not much money.

Do you also need wiring or fusing upgrades? I don't know about that.
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Unread 03-24-2013, 05:28 PM   #11
cory4um
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[[/INDENT]I had this saved. (just searched and this is 136amp unit)


I would just go with the 160 alt, new wiring (4 gauge?) All over and go from there...


Don't be scared to use the search. I learned tons of information just by typing my question in the box. Plenty of greatly detailed walk thru's

Here's a link that had some 160amp info
http://www.jeepforum.com/forum/f13/w...-swap-1330999/
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Unread 03-24-2013, 05:29 PM   #12
Charley3
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I think what I posted in my prior post would run 5 or 6 of your lights just fine.

I doubt it would work for 7 lights of wattage you describe.

To run 7 of your lights, need a powerful aftermarket alternator. Costs more...

If you must have a crazy powerful alternator, there is a guy on Ebay who takes Durango alternators, rebuilds them,, puts more wraps on them, which hops them up almost to power of a Green alternator. With the sooped up customized Durango alternator you could run all 7 lights, and the cost is half cost of a Green alternator.

Sorry I don't remember his Ebay name. Search Ebay.
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Unread 03-24-2013, 05:41 PM   #13
Charley3
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Have you heard of HIR halogen lights? That is next generation of halogen lighting.

Puts out 2.5 times the light for a given wattage

So you could use half the wattage and still be brighter.
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Unread 03-24-2013, 05:46 PM   #14
5-90
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Quote:
Originally Posted by HiDefXJ View Post
Help!
Just hooked up 4 of the 7 Offroad lights on my 2k xj and my rpm`s drop slightly when i turn em on (150 watts/each). I shudder to think what will happen to my stock alternator when I add the remaining 3 lights.
I have searched and searched and I have seen everything from upgrading the ground and pos wire to adding a battery or going with a Durango alternator, Also spending $500 for a H.O. alternator!
IS THERE AN EASY CHEAP-ISH SOLUTION?
I just want an inexpensive alternator that drops in without a lot of modification or high cost! Is there such a beast?
Other cheap/easy solutions?

Thanks everyone!
I've posted donor lists for COTS/OEM "upgrade" units that can be had for rather less than $500. Some grinding will be necessary, and you'll still want to upgrade your mains to take full advantage of the upgrade, but the whole job should cost you less than $500 (even if you go to a parts house for a replacement alternator.)

The donors listed should net you either 136A or 160A. You'll have to search up the list - I didn't keep a link.
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Unread 03-24-2013, 06:07 PM   #15
Charley3
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Regardless of what OP does for alternator, I still suggest a Group 65 Diehard Platinum battery.

Awesome on a budget!
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