i have an 02 yukon denali and the driver side window works when it wants to. i replaced the switch, and the regulator and its still doing the same thing. i took the door panel off checked all wiring, check for voltage at the plug to the regulator. everything is getting power. i checked the 25 amp fuse thats was good. im running out of possibilities guys. im starting to think its a short in the harness??? but whats the possibility of that?? any advice??