Owner of a 2004 f150 xlt supercab. Recently purchased. 174k miles. Truck is 100 percent and runs without any issues. ALTHOUGH my auto headlamps don't turn on. The dash will light up, stereo dims, hazard lights turn on, but no headlights. I've been researching it for a week or so and everybody mentions the security box behind the back seat. I inspected the box to find nothing wrong at all. No burnt wires or pins. Damn thing looks brand new. Wasn't a complete bust. I learned my door code in the process. But now I don't know where to go from here. Advice? Should I just replace the Sunload sensor? Other than that and the switch I don't know where else to look

 

Do they turn on manually? Do you have daytime running lamps?

 

I can manually turn them on. No I do not have daytime running lamps