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The video above shows you to replace the headlight in your 2003 GMC Envoy. Headlights grow dimmer by up to 20% over time and eventually burn out - for this reason, we recommend changing your headlights in pairs. Changing both headlight bulbs on your Envoy at the same time will allow both bulbs to have the same intensity and prevent the new headlight bulb from appearing brighter than the bulb on the opposite side. In some GMCs, the highbeam is the same bulb as the headlight and it is possible for the highbeam to work, but the headlight be burnt out even if they are the same bulb (and vise versa). Some GMCs have high intensity discharge headlights, sometimes referred to as xenon lights. These bulbs have a very high voltage that runs through them, even if the battery is disconnected. If your Envoy has this type of bulb, we do not recommend that you attempt to change it yourself.
When you change the headlight on your Envoy, it is important to not touch the glass part of the bulb with your fingers because the oil from your fingertips will cause that part of the bulb to burn hotter, which significantly shortens the life of the bulb.
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The burnt out tail light: classic reason for a cop to pull you over - change yours now2003 GMC Envoy SLT 4.2L 6 Cyl.
If your blinker doesn't blink, or blinks rapidly, you likely have a burnt out bulb2003 GMC Envoy SLT 4.2L 6 Cyl.
White light when you back up - yup, they burn out and you can replace them with bright LEDs2003 GMC Envoy SLT 4.2L 6 Cyl.
Because you have to start somewhere2003 GMC Envoy SLT 4.2L 6 Cyl.
On many cars, the high beam bulb runs at reduced power during the day - check 'em and change 'em!2003 GMC Envoy SLT 4.2L 6 Cyl.