2009 Hummer H3T Owner's Manual - Page 277

Service and Appearance Care 5-41 Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 5-43. For any bulb changing procedure not listed in this section, contact your dealer/retailer. 7. Turn the vertical aiming screw until the headlamp beam is aimed to the horizontal tape line. Turn it clockwise or counterclockwise to raise or lower the beam. The top edge of the cut-off should be positioned at the bottom edge of the horizontal tape line. 8. Repeat Steps 7 and 8 for the opposite headlamp. Headlamps To replace a headlamp bulb: 1. Open the hood. See Hood Release on page 5-9 for more information. Halogen Bulbs { CAUTION Halogen bulbs have pressurized gas inside and can burst if you drop or scratch the bulb. You or others could be injured. Be sure to read and follow the instructions on the bulb package. 2. Turn the bulb socket counterclockwise to remove it from the headlamp assembly and pull it straight out. 3. Unplug the electrical connector by pushing the release tab and pulling the bulb socket out. 4. Replace with a new bulb socket. 5. Reverse Steps 1 through 3 to reinstall.