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Unread 02-15-2010, 08:54 AM   #1
Ejunior2
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Fog Light Wiring - How many amps?

Anyone know how many amps the factory harness for the fog lights can handle?

If I've got this right the factory fog lights are 55 watts at 12 volts nominal. Right? So the max amps the factory system should be able to handle is 4.58 amps.

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Unread 02-15-2010, 09:40 AM   #2
Warren
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55 watts for the pair? Or each?

If it is each you are looking at @10 amps.
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Unread 02-15-2010, 09:44 AM   #3
2jhanna
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I would agree, approx 5 amps each, 10 amps for the pair.

If I remember correctly, that is about 16 gage wire.

The rule I generaly use is.

16 gage = 10 amps
14 gage = 15 amps
12 gage = 20 amps

I know others are going to through out "wire standard" specs. I just use this a a general rule.
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Unread 02-15-2010, 09:52 AM   #4
Avian
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amps = watts / volts

So, say with the engine off and battery supplying the power, 12v, a 55w pair of lamps will draw just a smidge over 9 amps, less with the alternator supplying power (14v = almost 8 amps). All of this is completely disregarding relay and wiring draw, but thats negligible in this situation.

A 10 amp fuse will be adequate.
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Unread 02-15-2010, 11:26 AM   #5
Ejunior2
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Thanks all. That's what I was thinking. I'm actually not looking for the fuse size. Just trying to figure out how many watts/amps I can pull through the factory wiring atthe fog lights per side.

I'm looking at replacing the incandecnt 55W fogs with some 4" 35w HID's. Draw is only 3.15 - 3.30 amps per light so I should be ok with the factory setup. I'll just want to splice them in and re-use the turn-indicator multi-switch.
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2006 JL Rubicon, white
4.0L, Auto, 4" FT LA lift, Bilstein 5100's, Currie HD tie-rods, Napa steering stabalizer, Currie lower cntrl arm skids, FT engine/oil skid, FT exhaust, Kilby sterring skid, SkidRow radiator skid, Mastercraft grab handles, Cobra 75WX cb, Wilson 3' ant, trailguide, Mopar iPod adapter, Coverking seat covers, Warn diff guard
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Unread 02-15-2010, 04:11 PM   #6
pumpman55
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I just removed my stock foglites and installed some 4" hids using the same wiring and switch i just can't run them with highbeems. the stock foglites pulled4.3 amps and the35 watthids pull 4amps box says 3.5 but it is closer to 4 amps. these lites are brite you won't need your highbeems
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Unread 02-16-2010, 07:15 PM   #7
Ejunior2
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Thanks. I'm looking at either the PIAA 510 or 540 at this point. i still want to run them as fog lights. Warn makes a smaller fog also 3.5" but I don't need the remote switch gimick. Anyone have experience with any of these lights? How's the output, pattern?
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Erik
2006 JL Rubicon, white
4.0L, Auto, 4" FT LA lift, Bilstein 5100's, Currie HD tie-rods, Napa steering stabalizer, Currie lower cntrl arm skids, FT engine/oil skid, FT exhaust, Kilby sterring skid, SkidRow radiator skid, Mastercraft grab handles, Cobra 75WX cb, Wilson 3' ant, trailguide, Mopar iPod adapter, Coverking seat covers, Warn diff guard
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