How To Install F150 Headlight Switch fog / driving lights

[GTXgp]

Basically, when you turn the switch on it sends a ground signal out. This would normally go to the BCM to activate the lights. Instead, you can send it to a standard 4-pin relay.

The second wire going to the switch is optional and it is a 12v+ signal to illuminate the fog light indicator on the switch. You would wire this to the same #87 from the relay.

I went to Fry's and picked up a connector that already has the proper d-sub pins WITH wires attached. It was cheap and I can salvage the wires to insert into my factory plug.



The only answer I don't have at this point is which pin is which (for the two new ones) on the connector. That will be easy to figure out once my switch shows up since one will get grounded when the fog is switched on and the other wont

 

[AbnMP13]

So you bought that other connector JUST for the wires?


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[GTXgp]

Well when you say it like that it sounds silly

It was only a couple bucks and the same price as the bare d-sub connectors since their smallest pack was a 50-pack and this way I didn't have to worry about attaching the wires to the d-sub

 

[AbnMP13]

Didn't mean it that way, someone posted above you could use a pick and get them out of the original plug.


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[GTXgp]

I could be wrong, but you should be able to just add the two wires to the stock plug. That is why Ika was showing different options for getting the pins.... to add to the stock connector. So I picked up the d-sub with wire, to add to the stock connector.

I will know 100% for certain once I tear into on Sunday.

 

[PropDr]

I could be wrong, but you should be able to just add the two wires to the stock plug. That is why Ika was showing different options for getting the pins.... to add to the stock connector. So I picked up the d-sub with wire, to add to the stock connector.

I will know 100% for certain once I tear into on Sunday.

That is what I did.

 

[AbnMP13]

I could be wrong, but you should be able to just add the two wires to the stock plug. That is why Ika was showing different options for getting the pins.... to add to the stock connector. So I picked up the d-sub with wire, to add to the stock connector.

I will know 100% for certain once I tear into on Sunday.

Now I got it. Makes sense now.

 

[Bigeffr]

I could be wrong, but you should be able to just add the two wires to the stock plug.

I did the same thing.

 

[AbnMP13]

I did the same thing.

Then plug the stock plug into the new fog light switch right?

 

[Bigeffr]

Then plug the stock plug into the new fog light switch right?

correct - however I cannot remember which pins they were but that should be easy to figure out once you have all parts in front of you.