Lights
Headlight and taillight lenses become dirty during normal operation. Clean all lights frequently to ensure a clear field of vision as well as visibility to other vehicles.
LED LAMPS
If an LED headlamp appears to have moisture or fogging inside the lens, disconnect the wiring harness from the headlamp(s) for a few days to allow the moisture to clear out.
HALOGEN LAMPS
When servicing a halogen lamp, don't touch the lamp with bare fingers. Oil from your skin leaves a residue, causing a hot spot that will shorten the life of the lamp.