I started creating a schematic for my pickup, while it's still fresh in my mind. I'm cheating a bit because my starting point is the 18 circuit GM Painless Wiring harness, but I have quite a few changes, including airhorns, OEM turn signal switch, master kill switch, ignition kill switch, Mallory Unilite, driving lights with relay, seperate backup lights, 800w amp, etc... I'm also creating a visual map that will show an outline of the truck and the location of the wires. I figure this would be the best way to address future potential problems, as well as preventing me from racking my brain after I've forgotten how I wired it in the first place. Just curious if this is a common practice. Anyone else?