The taillights on your 1980 GMC truck may stop working if a bulb fails, if the socket the bulb sits in becomes corroded or if the wiring is damaged. The wiring is the least likely to cause a problem and a blown bulb is the most likely. In any case, disassemble the light and check all the possibilities if one or both lights have stopped working. The taillight bulb used in these trucks is a standard dual-filament 1,157 bulb, available at any auto parts store.
Tools Used: Phillips screwdriver, Small wire brush, Dielectric grease
Repair Tail Light
Locate the mounting screws on the face of the taillight lens and remove them with a Phillips screwdriver. Set the screws aside and pull the lens straight off the taillight assembly.
Locate the bulb in the center of the housing and pushing slightly on it, turn it counterclockwise and remove it from the assembly. Inspect the bulb to determine whether the filament is damaged.
Clean the inside of the bulb socket with a small wire brush to remove any rust or corrosion. Place a small amount of dielectric grease in the socket and insert a new bulb. Press on the bulb slightly and turn it clockwise to lock it into place.
Position the taillight lens on the assembly then install the retaining screws. Tighten the screws with a Phillips screwdriver, being careful not to over tighten the screws to avoid cracking the lens.
Move to the opposite taillight assembly and repeat the process. Test the taillights by turning the head light switch on and verifying that the lights are working.
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