1999 GMC Sierra 1500 Pickup Owner's Manual - Page 121

Headlights and Vehicle Lighting Your lightswitchesareontheleftside ofyour instrumentpanel. Pushtheleftsidetheswitchwiththeparkinglightssymbol Parking Lights Sidemarker Lights ClearanceLights (if youhavethem) Taillights License Lights Plate instrument Lights Panel TransferCaseShiftIndicatorLight on it to turnon: Pushtheleftside of theswitchwiththemasterlightingsymbolon on theheadlights,togetherwith: Parking Lights Sidemarker Lights ClearanceLights (if youhavethem) Taillights License Lights Plate Instrument Panel Lights TransferCaseShiftIndicatorLight 2-53 it to turn