The following is a step-by-step guide to disabling the auto headlights on any 1999-2002(Includes Silverado, Suburban, Tahoe, Sierra, Yukon, Yukon XL, Denali, Denali XL). I can verify it will work on 2001's and 2002's for certain. It should also work on the '99's and 2000's if equipped. For this mod you will need one 1.5kOhm 1/2 watt resistor and some way to connect it to your pre-existing wiring on your BCM. HOW TO: Locate the BCM (Body Control Module) under your dash. Disconnect the Purple connector (C3) from your BCM. Locate the white wire (A6) and the gray wire (A4). Cut both wires and splice in the the resistor. Tape or heat shrink everything to mitigate the chance for shorts. Reconnect the C3 connector back to the BCM. Done. No more AHL's.