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Fog Light Wire Harness Problem

scz71864

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scz71864 Enthusiast

scz71864

Posted
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My buddy put fog lights on his truck. he just bought the lights and the housing and all that. then he bought an off brand wire harness to hook them up. we are having some trouble with this particular harness and how to hook it up. I know ground, power, and the two ends that go to the lamps. there are 2 other wires (blue, black)*black isnt the ground wire. a little help would be awesome. might just want to get the actual GM harness

image-2.jpg

MikeNH Senior Enthusiast

MikeNH

Posted
Posted

Well I'd have to assume they're the switched side power/gnd.

scz71864 Enthusiast

scz71864

Posted
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so if the other black is ground, and that blue wire is the one that goes under the fuse box with the fog light fuse?

99k1500 Enthusiast

99k1500

Posted
Posted

It would all depend on how the switch operates. I would guess that the blue and black wires you are referring to, go to pins 85 and 86 of the relay. In that case those two wires are simply the positive and negative of an electromagnet that acts as a switch. It doesn't really matter which way you hook it up. as long as one of the wires is positive and the other is negative when you want the device on.

If your switch supply's power when the lights need to be on then I would hook the black wire to ground and the blue wire to the positive supplying device.

If you switch supply's ground or a negative short to ground when it is activated then I would tie the blue wire to the red power that you have and connect the black to the switch.

Again blue or black, pin 85 or 86 doesn't really matter, it just needs current. The big deal is what you are using to turn this thing on.

 

Is he using the factory switch or an aftermarket toggle? If it were me and it were an aftermarket toggle then I would simply supply one wire from the toggle to ground and the other side to the black wire in your harness. I would then hook the blue wire up to the positive side of the battery (red wire in your picture.) This way there is ZERO current traveling through the firewall (assuming you have the relay in the engine compartment) unless the switch is on.

 

It really depends on how the switch that you are using supplies current. Many things in newer vehicles actually just supply a short to ground to activate a relay.

Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

yes we are using the factory switch

 

 

Is the factory switch a momentary switch or a off/on switch. Momentary switches will not supply constant power to the relay. The relay likely needs a constant power supply to stay activated.

 

Don't know what vehicle your buddy has, but, if it is a Sierra 07-12 W/T to SLE, I would get the factory harness and factory switch. They come with the gmaccessories fog light kit, and use existing wires in harness for the most part, with the last part of the harness supplied in kit. Don't know what Silverado kit has in it.

scz71864 Enthusiast

scz71864

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i have the factory switch just not the factory harness im pretty sure its an on and off switch

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