Fix and Build: GMC Sierra - Tail light turn signal

The turn signal on my 2003 GMC Sierra started to sound "aggressive". This sound is simply an indicator that one of the bulbs has burned out. Not sure if the same sound would come on for a different bulb, but in this instance, it was my back left turn signal. All you need to do is head to AutoZone, tell them you need a bulb for your vehicle, and they'll tell you which one to grab.

First, remove the two screws with a Phillips head. The turn signal is the middle bulb. Push down on the mechanism (pretty easy to see), and unscrew. Then, pull out the bulb. No turning, no latching mechanism. Then, pop in the new bulb. Redo everything you did.

Not sure about bulb grease. I purchase some but wasn't comfortable applying it to this particular bulb, even after a lot of internet research.

Be sure to wear gloves, don't touch the bulb.

Good resources:

How to Apply Bulb Grease & Why

How to replace a tail light on a Chevy Silverado

Replacing Light Bulbs