2 to 4 headlight conversion

Just out of curiousity, has anyone changed their 2 headlight grill (Single sealed beam) to the 4 headlight (composite) design? Obviously the adjustment brackets and hardware need to be changed, but I was just wanting to know what kind of changes need to be done to the wiring? The truck is a 91 and I want to upgrade the grill if possible.

I believe this article has the info you need.

http://www.fullsizechevy.com/forum/showthread.php?t=100877

That's perfect. Thanks alot.