Can I power 4 kc lights with my stock alternator? - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 08-19-2009
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Can I power 4 kc lights with my stock alternator?

I already have 2 kc driving lights which are 100 watts each, and i want to add 2 more long range kc's that are 150 watts each. Can the stock alternator power this?
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Old 08-19-2009
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yeah, I've powered 6 lights for years on the stock alternator
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Old 08-19-2009
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ya your fine. i power a 1000 watt stereo system and 2 150w KC lights and it does just fine
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Old 08-20-2009
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Quote:
Originally Posted by KS_FX4 View Post
I already have 2 kc driving lights which are 100 watts each, and i want to add 2 more long range kc's that are 150 watts each. Can the stock alternator power this?
Depending on the output of the OEM Alternator, you will be at the limits of most.
IMHO you should have a 100 amp out alternator to support the vehicle, 4 lights and a little in reserve for the future.

Add up the vehicle's requirements, ad in another 40+ amps for the lights and you have a minimum alternator output.
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Old 08-20-2009
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good luck finding 150 w ligthts. they discontinued them a while ago
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  #6  
Old 08-20-2009
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Originally Posted by God,Country,FORD View Post
good luck finding 150 w ligthts. they discontinued them a while ago
KC has the slim line 150s, just bought four...
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  #7  
Old 08-21-2009
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I have 4 130 watt kcs and 4 100 watt kc on my stock 130amp.
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Old 08-21-2009
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Originally Posted by herm59 View Post
I have 4 130 watt kcs and 4 100 watt kc on my stock 130amp.
The lighting alone, if all on at the same time will draw approximately 76 amps, add in another 45 amps for everyday driving and you are almost max'd out.

If KS_FX4 has the 130 amp alternator then there should be no problems but if it is a low output 65 amp then some where down the trail there will be, there will be...
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Old 08-21-2009
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there will be what? Im gunna be running 6 150W lights on my amp, dont know if its the 65 or 130 though.. knowing my truck, prob. the 65..
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Old 08-21-2009
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Originally Posted by God,Country,FORD View Post
there will be what? Im gunna be running 6 150W lights on my amp, dont know if its the 65 or 130 though.. knowing my truck, prob. the 65..
900 watts, divided by 12 volts gives you 75 amp draw.
If you consider that maybe your system is putting out 13.8 volts you are correct and you can drop the amperage draw to 65 amps, but with all of that wattage the battery won't last too long unless you have a high output setup. (the 13.8 volts the battery/alternator puts out is not under a load, when the lights are on, the stereo is on and the amp is pounding out enough bass to pop the windows the alternator will either be working it's heart out or blow up.

That's 75 amps at 12 volts, a load for sure but on a 65 amp or even a 90 amp alternator it's questionable how long the lights will stay on and the engine stay running.

If you have anything under 100 amp alternator, IMHO, you are in trouble when the lights come on, even with an extra battery.

If you want to run two batteries with isolator, then that will separate the vehicle operations battery from the high output accessory battery, you can do it but it will still be a load on the system without a high output alternator.

I am running over at the mouth again... later,

Last edited by Scrambler82; 08-21-2009 at 06:56 AM.
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  #11  
Old 08-21-2009
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haha no yoiur not lol.. I have a REd Top battery, so hopefully that will help a little..How do i find out which alternator i have?
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Old 08-21-2009
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Originally Posted by God,Country,FORD View Post
haha no yoiur not lol.. I have a REd Top battery, so hopefully that will help a little..How do i find out which alternator i have?
First a RED TOP HD battery will last a little longer but without an HD alternator to back it up it will die...

I am not sure how to determine this. Have a buddy at the local Ford dealer check it out, go to an auto-parts store, got me.

I am in the same boat you are, I need to determine the output of my alternator because I will be hooking up have six lights, four 150s (long range and driving) and two 100s (fogs)

if you do find the code for the alternator output let me know.
I hope someone will cut in here and tell us.
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  #13  
Old 08-21-2009
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yeah. I have the 4 150W LR's and 2 150W Driving lights
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  #14  
Old 08-29-2009
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Quote:
Originally Posted by God,Country,FORD View Post
good luck finding 150 w ligthts. they discontinued them a while ago
ya i got one of the last sets of the black 150 w KCs. dont you just love having something that you cant buy anymore
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  #15  
Old 08-29-2009
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Originally Posted by Scrambler82 View Post
KC has the slim line 150s, just bought four...

100000% BULL ****... there is NO 150w slim all slims are H3 bulbs max is 130w..

the 150W lights where sealed beam and need the larger daylighter housing for heat output... good try tho...
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  #16  
Old 08-29-2009
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um i had well over 1300watts on my silver truck... with a stock alt... lets just say i was on my 3rd one when i sold it lol....thank goodness for lifetime warranties lol..


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  #17  
Old 08-29-2009
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^ i love that truck.... and i REALLY want that lightbar/lights.. when you gonna come off that thing and sell it to me zach?
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  #18  
Old 08-29-2009
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Originally Posted by Redneckstone View Post
100000% BULL ****... there is NO 150w slim all slims are H3 bulbs max is 130w..

the 150W lights where sealed beam and need the larger daylighter housing for heat output... good try tho...
Looks like somebody just got OWNED
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  #19  
Old 08-29-2009
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Originally Posted by edgeman4.0 View Post
^ i love that truck.... and i REALLY want that lightbar/lights.. when you gonna come off that thing and sell it to me zach?
Never lol.. still debating putting it on the black one for now it sits enjoying its retirement...


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Originally Posted by Machine090767 View Post
Looks like somebody just got OWNED
ya and if he needs more proof he can read this...


https://www.ranger-forums.com/forum2...c+extravaganza
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  #20  
Old 08-29-2009
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Originally Posted by Redneckstone View Post
Never lol.. still debating putting it on the black one for now it sits enjoying its retirement...



one of these days stone... one of these days...

i'm gonna come up there, get you drunk and take it. as usual i'll leave the money on the nightstand on my way out.lol
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  #21  
Old 08-29-2009
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lol
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  #22  
Old 08-29-2009
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I wish I knew as much about KC lights as Redneckstone!
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  #23  
Old 08-29-2009
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Quote:
Originally Posted by Redneckstone View Post
100000% BULL ****... there is NO 150w slim all slims are H3 bulbs max is 130w..

the 150W lights where sealed beam and need the larger daylighter housing for heat output... good try tho...
Thanks, I needed that !

Can't argue the statement, I can't find them on the web, so i will back off on this but I would have sworn they were 150 w setups.
I have to check the package again just to make sure.

Sorry for any confusion here ...

Last edited by Scrambler82; 08-29-2009 at 05:30 AM.
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  #24  
Old 08-29-2009
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Originally Posted by 08XLT4x4 View Post
I wish I knew as much about KC lights as Redneckstone!
actually I dont hardly know much about then anymore there is tons of new styles that i havent even cared to look at lol
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  #25  
Old 08-29-2009
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Hey where did you get the light bar from? I would really like to find one like that.
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