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What I want to do is to add some aftermarket fog lights to my 2004 Mustang. What I want to happen is this….. I want the lights to automatically come on when I turn my low beam headlight on and I want them to go out when I switch to my high beams how do I wire them to make that happen?
 

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Mine does that stock.

All I did was, bolting on the fog lights, plug it to the harness and put in a relay and I was done.
 

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not if you wire it just like the harness u can buy .. the one i bought one wire went to a ground the other ran from inside the car from the fog light switch i put in.. those two wires run into a relay which i think had a ground connected to the fuse panel in the engine bay.. then it ran to an inline fuse and then to the fog light connectors then again if you dont wanna buy a relay, an inline fuse and the connectors you can just buy a wiring kit for foglights
 

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I just got GT Fog lights and since my car come pre-wired for Fog lights it was basically plug and play.
 
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