[gmachinz]

I just built an express down AND up harness for my K10 and added a second single window switch next to my 2-button master switch-this way I can either use the 2-button switch for each individual window, or I can hit the single switch once and have both windows go down or up simultaneously- basically the secondary drivers side window switch acts as a bypass jumper for the express feature.

I built a window harness for a Suburban with a rear slider window-the guy wanted all 5 windows to operate in express mode so I designed it for him to add a single switch to his master 4-button switch-hit it once and all 5 windows go up AND down. I've only built the Suburban one and now one for my pickup-works pretty nice.