I have to chime back it after reading your last post....Before you buy a dimmer or a headlight switch, do yourself a favor and either borrow or buy a volt/ohm meter (refered to as a multi-meter). Radio Shack, Home Depot, Lowes, or any hardware store sells them. You don't need to buy an expensive one, just a simple $20.00 small hand held meter.
And to answer your question, Ford made an early '04 F150 called the "Heritage", which is like the earlier (pre '04) models. That diller switch will not work on the late '04 to '08 F150's, that share the same dimmer switch. The headlight switch is different between '04 to '08 F150 models that had fog lights verses those that did not (the headlight switch pulls out to turn on the foglights on trucks equipped with them.
You can go to LMC Trucks web site and get a free parts catalog.
Once you have borrowed or bought a multimeter, check the dimmer switch and/or the headlight switch as Good old Bill has instructed you. He's wise. He knows what he's talking about. Take his advice. He is trying to save you money and aggravation.
If you buy the dimmer switch off of Ebay and it doesn't work, you'll buy the headlight switch. What if that is not it? Troubleshooting by tossing parts at something is too expensive.
If you plan to fix it yourself, you need the tools (in this case a multi-meter). If you don't have the tools, take it to someone that does and have them do it.
Or, just throw parts at it. Sooner or later, you'll get it (and empty your wallet).
Not trying to harp on you; just stating the facts.
"Never argue with an idiot; they'll only drag you down to their level, then beat you with experience"
2007 F150 STX Supercab (4.6 2V V8), Edge tuner, factory navigation, Mark VIII electric fan conversion with flex-o-lite controller.
Last edited by Bucko; 05-15-2009 at 04:43 PM.