i looked on zr2usa.com, blazerforum.com and this one but i have yet to find a simple diagram for upgrading to the all 4 or quad beam mod. i did it twice on 88-98 c/k truck w/o a problem. just 1 yes 1 relay and 4 wires. im just would really apriciate some info maybe a diagram of this done on say....01 and up s-series that has worked for some time. i only wanna do this once and i dont wanna guess at it. so can someone please help out a fellow forum member on this. thanks!