I just had simultaneous loss of low and high beams as well as foglamps on my 2004 F150. Parking lights are fine. Seems unlikely that all those fuses blew at once. Anyone have any ideas? Thanks!

 

The fuse that feeds the main headlamp switch ?

 

That would make sense to me (something "upstream" must be cutting off all of the lighting systems) but I've gone over the list of fuses in the manual a dozen times and can't find anything that sounds like it feeds into all three of the light systems affected.

 

Don't know which 2004 you have ( heritage or new body style )

2004 Heritage ( same as 2000-2003 MY )
Should be the BJB ( aka Battery Junction Box , engine compartment fuse panel ) fuse #3 - 30A, hot at all times

2004 New body Style

should be CJB ( aka Central Junction Box, cab fuse panel ) fuse # 40 - 20A. There is also another fuse # 6 - 15 A that feeds the main headlamps switch if memory serves me correctly this is the parking lamp circuit, not power to the headlamps.
- 2004 & 2005 were a the one off MY from the 2006-2008, so it could be slightly different location, but start there.

I have no idea what ford calls them, thought it would have had the correct name on it ???

 

Ford has told me that the problem is that after market headlight bulbs draw too much current and have caused the wiring harnesses to burn through. Need to replace both harnesses and return to Ford bulbs.

Thanks for everyone's help. Hope you don't experience this problem.