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  #1  
Old 03-03-2011, 11:57 AM
RedNeckMetalTruck RedNeckMetalTruck is offline
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Default Off Road lights using Fog Light Switch

I had stock fog lights on my 01 XLT 4x4. I took those off and mounted 3 130W lights on my bumper using the same switch, fuse and relay. They don't seem as bright as when I tested them out connected strait to the battery. What do I need to change to get the lights brighter?

Thanks for the help.
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  #2  
Old 03-03-2011, 12:03 PM
rwenzing rwenzing is offline
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Default Re: Off Road lights using Fog Light Switch

They aren't wired in series, are they? If you are using adequate wire gauge and have them wired in parallel, the light output should be virtually the same as when powering them directly from the battery.
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Old 03-03-2011, 12:04 PM
Clinton Clinton is offline
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Default Re: Off Road lights using Fog Light Switch

You may have to run the power to the battery and see if you need a relay if you dont have one already
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Old 03-03-2011, 12:12 PM
RedNeckMetalTruck RedNeckMetalTruck is offline
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Default Re: Off Road lights using Fog Light Switch

Two of them are wired to one side, one is wired to the other. So no, two in series, one not, but they're all the same brightness. (as far as I can tell)

Well maybe not, I'm not too advanced in this type of thing. I took the (stock) right side fog light wires and soldered two wires out of the positive and two wires out of the negative. On the left I just connected positive and negative.
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Old 03-03-2011, 12:20 PM
rwenzing rwenzing is offline
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Default Re: Off Road lights using Fog Light Switch

So you are actually running three 130W lights, all in parallel, in place of two 42W fogs and still using the stock 18ga wires - that could explain the reduced output. You must have had to increase the fuse size (eek!) since those lights are drawing about 33 amps and the factory fuse is sized at only 20 amps. This sounds like the recipe for a potential electrical fire.
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Old 03-03-2011, 12:30 PM
RedNeckMetalTruck RedNeckMetalTruck is offline
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Default Re: Off Road lights using Fog Light Switch

I didn't increase the fuse. Its still at the stock 20 amp. (Can't remember which one exactly) So it sounds like it would be worth it to invest in a wiring kit and make sure its got something thicker than 18 gauge wire... Would 16 or 12 do the trick or do I need to go even thicker? Then just keep my OEM fog light switch?
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Old 03-03-2011, 01:11 PM
rwenzing rwenzing is offline
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Default Re: Off Road lights using Fog Light Switch

I must not understand correctly because something in the numbers isn't adding up.

390 watts / 12 volts = 32.5 amps

Anyway, I think that the simplest answer is to use the existing 18 gauge fog wires to power a relay coil to switch larger wire (maybe 10~12 gauge) from a fused source (perhaps 40A). It seems like anything else would require a major tearup of the harness and the Distribution Box.

That's how I'd probably do it. Obviously, it's your truck and your call.
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Bilstein 7100 rezzies, Cadillac/Mustang rear discs, Duff traction bars
Keypad Entry, Lock LEDs, ABS switch, sway bar discos
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  #8  
Old 03-03-2011, 01:32 PM
buggman buggman is offline
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Default Re: Off Road lights using Fog Light Switch

What rwenzing said.

Use one of the OEM fog light +12v wires to activate a relay, fused at the battery to power those lights.

(edit)
I'd use 14ga wire (MINIMUM) for the lights & 12-10ga for the main power/ground just to be on the safe side.

It's a miracle you haven't melted the OEM wiring with that much load on the 18ga - 16ga wiring.

It's better to be safe than sorry... $5 for a relay & fuse holder may save your truck from burning up.
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Last edited by buggman; 03-03-2011 at 11:53 PM. Reason: edit
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  #9  
Old 03-03-2011, 02:19 PM
RedNeckMetalTruck RedNeckMetalTruck is offline
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Default Re: Off Road lights using Fog Light Switch

I have not been using them that often or at all, which has probably been a good thing. hahaha.

Thanks for the input guys, I appreciate it.

Ill let you all know how it goes.
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Last edited by RedNeckMetalTruck; 03-03-2011 at 02:22 PM.
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  #10  
Old 03-03-2011, 03:14 PM
FireRanger FireRanger is offline
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Default Re: Off Road lights using Fog Light Switch

I concur. Your setup as it stands right now defies the laws of electrons and shouldn't be working at all. You've greatly exceeded the capacity of the stock wires, relay, and fuse. How it is working at all, or how it isn't on fire, is a mystery.

You're going to need two relays since they're only rated to 30 amp at the most. Two one and one on the second. Main power from the battery to the relays to the lights should be 10-12 gauge with an inline 40 amp fuse within 6" of the battery terminal.
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  #11  
Old 03-03-2011, 05:43 PM
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Default Re: Off Road lights using Fog Light Switch




bold red wire = 10ga ~ 12ga

thin red and green wires = stock internal wiring (16ga)

...and, don't forget the fuse(s) on the power feed into the relays, preferably installed within 6" of where it connects to the battery positive terminal.
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Last edited by turbo; 03-03-2011 at 05:46 PM.
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  #12  
Old 03-03-2011, 05:57 PM
FireRanger FireRanger is offline
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Default Re: Off Road lights using Fog Light Switch

The other option is using the existing + & - wires at the fog lights to directly drive the two relays. Saves you all the wiring through the firewall. From my how-to:



It says fuses should be 24" from the source, which is an error. As both turbo and I stated, it should be within 12".
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