I posted a thread telling how to make your Fog lights and Low beams work when my High beams are on. Do a search for Headlight mods and my screenname. I have my diagram somewhere. I will try to locate it. As I think about it... I think the 2003 qne older models you ground 1 of the wires coming off the highbeam. And on the 2004 to 06 you use a 12 volt resister in the wiring harness under the steering column. I will try to locate my information...

 

Be careful. In most states it is the law that when high beams are on fog lights have to turn off. I'm speaking from experience. I got a ticket when i put fogs on my 72 firebird and didn't wire it to go off with the high beams

 

That is a good point my friend!

 

No problems for me and it has been years. Infact I have driven all the way to work numerous times with my low/ high and fog lights on, but that has just been my experience.

 

Okay I know it has been a while since this thread was posted, but I finally found the link to the headlight modifications. So here it is. There is alot of reading, but it is worth it if you want your highbeams and fog lights to work with your regular beams. Here is the link: http://www.performancetrucks.net/for...9&page=1&pp=10