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Unread 04-27-2010, 10:42 PM   #1
gunnerscherlin
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Max number of 130 watt lights my alternator can handle?

I have a wj and have 4 130 watt lights on it already but i want to put on 4 more pencil beam lights from hella but i dont know if my alternator can handle the draw. Does anyone have advice or know if it can hold up?

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Unread 04-27-2010, 11:07 PM   #2
robd2003
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depends how many amps the lights draw, and if you have everything running i.e. all "8 lights" or you can switch between which ones are on and off
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Unread 04-27-2010, 11:10 PM   #3
ras2001wj
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Why would you possibly need so much light?

And a few corrections to your profile:
You have a 42re transmission, the NP242 is your transfer case(not PN242),
Your front axle is a Dana 30
Your rear axle is either a Dana 35 (most probable) or a Dana 44a (with the towing package), the dana 42 never existed
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Unread 04-27-2010, 11:13 PM   #4
gunnerscherlin
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I am planning on using all 8 of them and sorry ras2001wj i didnt feel like lookin up the info lol but thanks dude
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Unread 04-27-2010, 11:30 PM   #5
yozsi
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well figure that you are operatating at about 13.5-14.5 volts when the car is running. so that is 8.97 to 9.63 amps per lamp at those voltages.
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Unread 04-27-2010, 11:49 PM   #6
ratmonkey
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If you're crawling on a trail, with all that and your stock lights running. You'll be drawing down the battery as your alt will never keep up.

Work on light placement and aiming. I can't think of any reason to have that many pencil beams and floods/fogs on at once.
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Unread 04-27-2010, 11:52 PM   #7
JesseOR
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He wants to cook the deer before he hits it! or dry up all the mud so its not as slick!





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Unread 04-28-2010, 12:41 AM   #8
straty1987
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Quote:
Originally Posted by gunnerscherlin View Post
I have a wj and have 4 130 watt lights on it already but i want to put on 4 more pencil beam lights from hella but i dont know if my alternator can handle the draw. Does anyone have advice or know if it can hold up?
right now you have 4 lights
130 watt * 4= 520 watt
50watt / 12v = 43.33 amps

want to
130 watt * 8= 1040 watt
50watt / 12v = 86.67 amps

the stock WJ alternator is 136 amps i believe

might want to consider your needs and build around that. dont want to kill your battery or start a fire. like mix in fog and driver lights so you can get distance and better lights around you.

if your going to do 4 130 watts light on the roof consider doing 4 55watt lights. 2 driver lights (pencil beam) for distance and 2 fog lights to get a better view on your sides.

if you have any pics i like to see the 4 130 lights your running.
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Unread 04-28-2010, 08:25 AM   #9
gunnerscherlin
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Well i already have 4 driving lights on the grille but thinking about adding the 4 up top and ill get pictures up soon
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Unread 04-28-2010, 08:28 AM   #10
xJoshxx
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Tip get the BIGGEST battery you can get to fit in your Battery Tray.

i have 6x130W KC Long range lights.

if i turn them on at idle you can hear the jeep idle up for moar power to the battery and watch the battery gauge move a little unless your driving.

i have a 1200cca battery
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Unread 04-28-2010, 08:30 AM   #11
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You can get an eye exam and prescription lenses @ walmart for about $150.
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Unread 04-28-2010, 08:38 AM   #12
xJoshxx
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You can get an eye exam and prescription lenses @ walmart for about $150.
already did that haha but i live in the sticks with plenty o forest blind curves that deer like to setup traps.
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The SRt-8's are a liberty design.
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Unread 04-28-2010, 04:22 PM   #13
gunnerscherlin
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I live in Wyoming so highway driving sucks at night cause the damn deer go out of their way to get hit so light is good
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Unread 04-28-2010, 09:12 PM   #14
comptiger5000
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The key is using the right lights (beam pattern) and getting them aimed well, as well as making sure your headlights are working well. You'll get more from your headlights + 2 lights that put the light where you need it than you will from 10 lights that put it somewhere else.
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Unread 04-28-2010, 11:09 PM   #15
gunnerscherlin
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Amen to that

True right now i have the 2 middle ones pointed barely out but mostly forward and the outside 2 are pointed inward so the make a big X so they cross far away but also give a lot of light forward too.
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