If the piece of metal inside the taillight fuse is intact, the fuse is still good. If the piece of metal looks broken or fractured, the fuse is blown and will need replacing. Use your fingers or a tweezer to take out the fuse. Most new cars have a fuse extractor in the fuse box or in the tool kit. It is a small white plastic tool that resembles a pair of pliers. Bring it to an auto store to find a match, then buy a replacement and insert it in the proper position to replace the blown fuse.
On most new cars, the wiring harness is located behind panels in the trunk and is not accessible without removing the panels.
Most tail lamps have stop lamp/turn indicator bulb(s), reverse lamp bulb, tail lamp bulbs, side marker bulb, and on some models a self standing turn indicator bulb. On cars where the brake and turn signal are sharing a bulb, when the bulb is burnt out, the turn signal indicator will flash faster than normal. This will apply also if the vehicle has a burnt out turn signal bulb in the rear amber turn indicator. If the bulb is burnt out, you’ll need to replace it. Take it to your local auto store and buy the correct model for your car. If the bulb is fine, your car may have a deeper electrical problem. If the fuse, taillight wires, and bulb are all in good shape, it’s time to take the car to the mechanic. When you remove a bulb for replacement, you should inspect the socket for burnt contacts and the tail lamp for burnt contacts or melted socket boards. [5] X Research source
You want to clean and dry the area where the tape is to be applied. Just before adding the tape wipe the area with a lint free cloth that is wet with rubbing alcohol, and let it dry, then apply the tape. Do not use glass cleaner to clean the area because the ammonia in the glass cleaner will cause the tape not to stick as well as it should. The last wipe with rubbing alcohol will remove most of the impurities and leave a clean surface. Measure the size of the crack and cut the tape slightly larger than the damage of the lens. Remove the backing of the tape. Smooth out the air bubbles when you apply the tape, so they don’t distort the lens.
Cover the outside of the taillight with the plastic tape that comes with the repair kit, to prevent the plastic resin from leaking through. Mix the resin with a catalyst and coloring agent according to the instructions included in the kit. Wear a pair of disposable gloves during this part of the process to avoid getting resin on your skin. Pour the resin into the provided syringe. Squirt the resin into the hole, making sure it covers the entire area that needs to be filled. Let it cure for at least 2 hours. Remove the tape and sand the surface to smooth it out.
