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Old 01-04-2007, 01:32 PM   #1
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Hows mant lights can stock alternator hold

Does any one know how many 100 watt off road lights a stock alternator can hold with out over loading it i have six new nights i dont know if mine can take it if not where can i find a more powerful alternator. its a 1997 tj

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Old 01-04-2007, 01:42 PM   #2
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not if this will help or not but when i had my 98 xj i had 6 100w lights on a stock system with optima marine battery. used them quite often and had no problems for the 3 years i had it.

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Old 01-04-2007, 01:45 PM   #3
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Does any one know how many 100 watt off road lights a stock alternator can hold with out over loading it i have six new nights i dont know if mine can take it if not where can i find a more powerful alternator. its a 1997 tj
Are you wheeling in a cave?
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Old 01-04-2007, 04:10 PM   #4
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Its not so much the wattage on the bulbs but the amperage draw that you'll need to add up. you can look in the manual to get the amperage rating on the stock alt. if I remember right it's pretty high compared to most other vehicles. You should have no problem running 6 extra lights from the stock system. Its just if you wanted to run the AC, a 9K lbs winch and air compressor AND 6 extra lights where you might need to upgrade.
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Old 01-04-2007, 04:41 PM   #5
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thanks for the help
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Old 01-04-2007, 05:33 PM   #6
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does anyone know where i could find the amount of amps the alternator puts out. I dont have the manual i bought it used and they did not give me one
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Old 01-04-2007, 06:45 PM   #7
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1997's with 4 or 6 cyl use the same alternator, its a 90amp output.

MeanGreen make some high output alternators, but you'll pay out the @$$ for one.
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Old 01-04-2007, 06:56 PM   #8
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I've also heard that some of the high output 150A or so alternators used in Dodge Ram 3500's supposedly can practically bolt up. Not sure of the specifics, but I know a few people have done it - worth googling since these will cost a LOT less than a mean green unit.
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Old 01-04-2007, 07:00 PM   #9
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Old 01-04-2007, 07:11 PM   #10
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BTW - I'm sure if you head down to an AutoZone and, if the guy is in a good mood, they can look up each year and tell you if the alternator is the same... hell they'll have them in hand to compair to eachother to see if they work.

I know that the part number for a stock '97 TJ is a #13199 Import Alternator. Same as for:

# 1991-1998 Jeep Cherokee
# 1991-1992 Jeep Comanche
# 1992-1998 Jeep Grand Cherokee(4.0L Only)
# 1991-1997 Jeep Wrangler
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Old 01-04-2007, 07:13 PM   #11
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TRIPPLE POST! lol

This shows you what year you'll find the 136amp alternator described in the above link.
http://www.vicic.com.tw/alternators/gvdn11361203.htm

Lis of other vehicles that cary the stock 90amp alternator
http://www.vicic.com.tw/alternators/gvdn10901210.htm
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Old 01-04-2007, 07:55 PM   #12
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I have done this swap with a Grand Cherokee alt into my YJ. I am currently running 5x100watt KC lights, and 4x55watt rock lights, and it runs just fine.
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Old 01-04-2007, 08:10 PM   #13
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thnaks alot the web site has been the most help i have ever gotin glad i joined
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Old 01-04-2007, 08:25 PM   #14
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Glad we could be of help!
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Old 01-05-2007, 09:02 AM   #15
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WOW, I was thinking of buying one of the higher priced alternator's to upgrade but this looks like it could save me a lot of $$$. Would anyone recommend upgrading the battery? What's the difference between the plane stock one and an Optima? Would the red top or the yellow top work better? I'm thinking of adding a winch and 2 100watt KC's and maybe in the future some rock lights.
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Old 01-05-2007, 09:22 AM   #16
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AzTJ,
That is a very helpful link.
Thanks,
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Old 01-05-2007, 09:28 AM   #17
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Depending on which year wrangler you have some had a stock alt that puts out ~136 amps. If you get the part number off your alt I can look it up and tell you which one you have
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Old 01-05-2007, 09:30 AM   #18
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I'll try to post it sometime today. If it helps, I have an 03 with the 4.0 and a Dana 44 in the rear.
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Old 01-05-2007, 09:49 AM   #19
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Quote:
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WOW, I was thinking of buying one of the higher priced alternator's to upgrade but this looks like it could save me a lot of $$$. Would anyone recommend upgrading the battery? What's the difference between the plane stock one and an Optima? Would the red top or the yellow top work better? I'm thinking of adding a winch and 2 100watt KC's and maybe in the future some rock lights.
Upgrading the battery does absolutly nothing to increase the performace of the electrical system when the car is running. All an upgraded battery will do is provide you with power when the car is off. after you start your jeep you can take the battery completly out and it will still run and give you just as much juice as when it was in. your alt runs at that point. The only reason to upgrade you battery would be 1. if you run your accessories with the engine off for long periods of time. 2. if you use your battery for heavy duty purposes, such as starting a desiel or running things like and air compessor when the engine is off. 3. If you ever run your Jeep thru things that would submerge the battery (you'll want a sealed setup such as optima) or 4. If you continually run your battery down and charge it up you'll want a deep cycle that will hold a charge better.

I personally have a Red-Top optima battery, I like the idea of having the extra power when I need it, it being a sealed system, and I've used them before. but the best thing I liked about it, it was free or I woulda just got a Wal-Mart special. But the money I would have spent on the Optima I would have invested in the upgraded alt that you don't really need unless you have 30 lights + or even in a budget boost. IMHO an upgraded battery or alt is just for bragging rights and if thats your thing then go for it but I think the $ could be put to better use elsewhere on the rig.
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Old 01-05-2007, 09:58 AM   #20
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I do use my air compressor when the Jeep is off the air-up but I'm sure if/when I get a winch the Jeep will be running.
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Old 01-05-2007, 10:02 AM   #21
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IMHO an upgraded battery or alt is just for bragging rights and if thats your thing then go for it but I think the $ could be put to better use elsewhere on the rig.

I guess you don't wheel much with a winch. From the rigs I run with I've seen what a winch can do to a stock system. I've also seen what a winch can do to a highly upgraded electrical system. For instance. One friend has the mean green alternator setup with a yellow top optima made for long current draws. Find a friend that is really stuck on a long pull and it doesn't take long to zap all the juice in his battery. Of course it will recharge even if it were a stock setup but it recovers faster with the upgraded system.


Lets put it another way. You want bigger tires. So you buy bigger tires. Do you need some lift to clear them? In most cases... yes. You can't do one without the other. I feel the same way about electrical systems. Specifically because I was into car stereo(IASCA) forever where I saw the added benefits of better components. I say that an upgraded alternator and battery are very viable upgrades.
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Old 01-05-2007, 10:12 AM   #22
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Maybe this would be another good upgrade for me. The upgrades never end!!
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Old 01-05-2007, 11:35 AM   #23
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Quote:
Originally Posted by MR.CLIFFORD View Post
I guess you don't wheel much with a winch. From the rigs I run with I've seen what a winch can do to a stock system. I've also seen what a winch can do to a highly upgraded electrical system. For instance. One friend has the mean green alternator setup with a yellow top optima made for long current draws. Find a friend that is really stuck on a long pull and it doesn't take long to zap all the juice in his battery. Of course it will recharge even if it were a stock setup but it recovers faster with the upgraded system.


Lets put it another way. You want bigger tires. So you buy bigger tires. Do you need some lift to clear them? In most cases... yes. You can't do one without the other. I feel the same way about electrical systems. Specifically because I was into car stereo(IASCA) forever where I saw the added benefits of better components. I say that an upgraded alternator and battery are very viable upgrades.

And I agree with that and think it falls under the 'heavy duty' part of the post I wrote. But under no circumstances would I ever winch without the engine running, that much draw on the battery will not be a healthy thing. By all means YES upgrade the elecrical if you winch but that wasn't the question I was answering. it was about lights. I've sold/installed/fixed Car Audio for almost 5 years. As for the car stereo part a capacitor will go alot further than an optima for performance on a stock alt. If you are building a comp system for the IASCA then thats a Hell Yes twards an upgraded electrical. I'm with you on that, upgrade the alt, the battery and get a power cap, run 0 gage the whole 9 yards Most folks don't go that far and run a simple sub/amp setup with maybe a 4 channel and new speakers.
I was trying to keep it relevant to the lights question and I still stand by my original suggestion that if you want to run a few extra lights you don't have to upgrade.
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Old 01-05-2007, 12:07 PM   #24
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I agree with that. I upgraded my battery to an optima since I like to run my lights to setup camp with the engine off. I installed a nice voltmeter to monitor performance just in case
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Old 01-05-2007, 02:15 PM   #25
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I installed a nice voltmeter to monitor performance just in case
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Old 01-05-2007, 06:47 PM   #26
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Ater working for autozone(horrible company, but decent people) I've seen and heard thousands of stories about Optimas. Johnson Control bought them out a few years back and thier quality has since dropped. They are still decent batteries, but not for the $200 price tag. A good $80-90 battery will be just as good for power consumption, but the only realy benefit from an OPtima is that its a sealed gel battery meaning no leaks and no more bad cell's from vibrations. I'd reccomend an optima if you plan on running extra lights(when engine off) or a stereo, or a winch, and do some good offroading. But if not, I'd stick with a conventional lead-acid battery.

For my delivery truck, with a hydraulic lift gate, we are using a Duralast Gold from autozone. It has more than enough power to crank over any motor. We can run the lift up and down about 10 times and still be able to start the truck afterwards. But putting that kind of a strain on a batter, no matter what brand, will wear low a lot faster.
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Old 03-07-2007, 11:21 PM   #27
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Even with a high quality Jeep alternator or battery... If you strain it often it will wear much faster... Beside you can look up to your manual how much power it can carry to make its life last longer...
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Old 03-08-2007, 10:23 PM   #28
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4x 130W high beams and 2x 65W fogs are no problem.
but when i use my horn at th esame time (50 amperes compressor) the light becomes very very dark...

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