Before replacing the exterior light bulb, remove the ground wire from the battery. Remember that if the light bulb has just been on, it may be too hot.
Before replacing an exterior light bulb, check the appropriate electrical circuit and fuse. Do not touch the glass bulb of the lamp with bare hands. The fingerprint evaporates and is deposited on the reflector, resulting in poor lighting. Be sure to replace defective lamps with lamps of the same type. Wipe inadvertent touch marks with a clean, wax-free cloth or alcohol.