So, has anyone here ever added an auxiliary power lock switch at the barn doors on a truck that did not have one? Or have I missed the thread? I want to add a door-lock switch on the D pillar on my 1995 K2500 Sub. It has power door locks, but it does not have the harness pigtail for the switch that later models seem to have. Can I just tap into the "lock" and "unlock" wires at the D pillar and provide a positive (+) source? Or does the '95 use the (+) lock and (+) unlock, with a "trigger" wire? If anyone has done this, or knows of information outlining the process that would be nice. Thanks!