So I am having a very interesting issue with my head lights, I just got a 2007 GT with LED swap. All the light seem to work just fine but the head-lights!
When I unlock the car with the key fob the headlight DO work, however when I try to turn them on with the light switch they DON'T turn on!
The LED rings work, the fog lights work, the high beams work! I tried a new the light switch and it didn't fix the problem.
Any help or ideas?

 

Headlamp Fuse is blown?

Check voltage at the connector using a multimeter.

Put back in the regular bulbs. It may be whatever LEDs you put in there aren't good enough to run with the car, as silly as that sounds. There are instances, as their load isn't great enough/they aren't built to 'match' what you had in the car.

Headlamp switch is possibly bad.

Other wiring issues, just have to trace back.

'Bout it really. Good luck. And welcome to the forums!

 

The 2007 gt does not have headlight fuse. Only high beams and fog light fuses... kinda crazy. I doubt is the switch since I already tried a new one and same result.

I am thinking it might be grounding somewhere but not sure. Previous owner did some wiring work so all the wiring is kind of a mess. I will trace back as you recommended but nor sure even where to start.
Thank you for you help! Let me know if you come up with other ideas!

Best!

 

According to this...

Interior fuse box, right kick panel fuses 7 and 8 for left and right headlamps, 10A each.

If you have HID lamps in the car, then engine bay fuse panel fuses 26 and 27, 20A each.

So... maybe go check anyway?