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Old 04-01-2014, 04:35 AM
IKEA52 IKEA52 is offline
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Question Wiring aftermarket fog lights on OEM switch

Good Day All,

I am looking at installing PIAA 510 fog xtreme white plus halogen lights in place of my current fog lights on my 2013 F350 as the stock ones will not work in my trailready HD bumper.

The general install of the fog lights is very easy to do. The only problem I am having is I would like them to still be controlled by the factory switch instead of having to install the switch provided or use one of my uplifter switches.

Basic run down of the PIAA wiring harness is at:
http://www.piaa.com/Shared/instructions/510.pdf

My only question is how I can eliminate the switch provided and use the factory switch to operate these lights

Any comments or suggestions are greatly appreciated.

IKEA
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Old 04-01-2014, 03:56 PM
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Franklin2 Franklin2 is offline
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Hook it up like the diagram with the switch in the engine compartment temporarily. Hook the "switched power" wire to the battery + temp also. Get it all working with the switch.

Once you get that, get a teetlight and poke the little wires going from their switch to the relay box. Probably one of these is ground(for a pilot light in the switch) and the other is power to trigger the relay. Poke the wires and find the one that has voltage when the fog switch is pressed and makes the lights come on, and does not have power when the switch is off.

Once you find that wire cut it, and run it down to one of the original plugs going to the original foglamps. Make sure you get the hot side of the plug. Tie this wire going to the new relay to the hot wire in the original fogplamp plug.

Now when you tell the original fogs to come on, the Ford wiring will send voltage down to the original foglamp plug, and this will trigger the new relay and turn the new lights on.
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Old 04-02-2014, 01:46 AM
IKEA52 IKEA52 is offline
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Originally Posted by Franklin2 View Post
Hook it up like the diagram with the switch in the engine compartment temporarily. Hook the "switched power" wire to the battery + temp also. Get it all working with the switch.

Once you get that, get a testlight and poke the little wires going from their switch to the relay box. Probably one of these is ground(for a pilot light in the switch) and the other is power to trigger the relay. Poke the wires and find the one that has voltage when the fog switch is pressed and makes the lights come on, and does not have power when the switch is off.

Once you find that wire cut it, and run it down to one of the original plugs going to the original foglamps. Make sure you get the hot side of the plug. Tie this wire going to the new relay to the hot wire in the original fogplamp plug.

Now when you tell the original fogs to come on, the Ford wiring will send voltage down to the original foglamp plug, and this will trigger the new relay and turn the new lights on.

Thanks Franklin2,

Your help is much appreciated and really easy to understand. Just one other question once I connect the hot wire from the PIAA on/off switch to the hot wire of the factory fog light plug what do I do with the PIAA switch power wire, and the ground - pilot light - wire that runs to the PIAA on/off switch?

My thought is I can discard the PIAA switch power wire which runs from the on/off switch through the connector to the power source (temporarily the battery). I then would take the ground - pilot light - wire and hook it up to the ground wire that's with the factory fog light plug that I hooked my power wire to.

Please let me know if I am on the right path before I short everything out and burn down my truck

IKEA
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Old 04-02-2014, 03:13 AM
IKEA52 IKEA52 is offline
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Hook it up like the diagram with the switch in the engine compartment temporarily. Hook the "switched power" wire to the battery + temp also. Get it all working with the switch.

Once you get that, get a testlight and poke the little wires going from their switch to the relay box. Probably one of these is ground(for a pilot light in the switch) and the other is power to trigger the relay. Poke the wires and find the one that has voltage when the fog switch is pressed and makes the lights come on, and does not have power when the switch is off.

Once you find that wire cut it, and run it down to one of the original plugs going to the original foglamps. Make sure you get the hot side of the plug. Tie this wire going to the new relay to the hot wire in the original fogplamp plug.

Now when you tell the original fogs to come on, the Ford wiring will send voltage down to the original foglamp plug, and this will trigger the new relay and turn the new lights on.
Also too would you install a fuse on any of these locations:
The positive wire between the lights and the battery?
The positive wire between the relay and the battery?

Or would you not worry about installing a fuse?

IKEA
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Old 04-02-2014, 05:49 PM
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I thought you wanted to delete the original switch. So once you found the correct hot wire to make the relay click, you could cut the other wire going to the relay(like I said I "think" that is a ground wire for the pilot light. Try it all first).

I don't think you need a fuse, the original foglamp has a fuse and though it's a little big, it should still protect the wiring in case something happened.

You do need a fuse from the battery + to the relay. The contents page says this kit has a fuse, but I don't know where it's located.
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Old 04-02-2014, 05:49 PM
 
 
 
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