1Check the fuse. A blown fuse usually causes both lights to go out. On newer cars, the tail lamps can be fused separately and/or each bulb or shared circuit can be fused. A fuse can be blown due to other problems, so you'll need to check more than just the fuse, but it's the right place to start. Look in your owner's manual to determine where the fuse box is located in your car.
2Look at the tail lamp wiring. These are the wires that lead to the tail lights, located inside the lid of the trunk. Open the trunk and take a look. You can see where the wires should connect in order for the electrical system to properly work. If a wire has come loose, reattach it.
3Check the taillight bulbs. If the fuse and wiring look right, the bulbs themselves might be the problem. To check them, unscrew the taillight lenses from the outside using a screwdriver.
4Check the taillight lenses. Whether or not you were able to fix the problem of your tail lights working correctly by examining the fuse, wiring and light bulb, it's important to check the lenses as well to make sure they're not cracked or broken.
The
process for replacing tail light bulbs is the same in all models. If
you have a burnt-out tail light bulb, you may need to replace the
brake light, the reverse light or the turn signal. The procedure to
replace each of the bulbs is the same.
Instructions
1.
Open the Hummer's rear swing gate. This will expose the edge of the
vehicle's tail light assembly. You'll see two small Phillips head
screws that hold the tail light assembly in place. Put on your
gloves.
2.
Remove the two screws from the tail light assembly. Pull the tail
light out and inspect the back for two bulbs. The top bulb is the
brake light and turn signal. The bottom bulb is the reverse bulb.
Determine which bulb you need to replace.
4Push
the replacement bulb into its socket firmly. Insert the socket back
into the tail light. Turn it clockwise to secure it in place.
5Place
the tail light into its cradle. Hold it with one hand and replace
the Phillips head screws with the other.
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