When low-beam headlights do not work, but high beams are functioning correctly, the most likely cause is a bad dimmer switch. A bad dimmer switch can also result in the opposite problem, where low beams working but high beams are not. Dimmer switches are usually integrated in the steering column where the headlight switch is mounted.Know More
To test the dimmer switch, necessitates removing part of the steering wheel column and possibly the dash panels in order to access the wires. A multimeter is necessary for testing voltage, and a wire-piercing probe makes the test process easier. There are three relevant circuits; the high-beam headlight feed, the low-beam headlight feed and the headlight-switch input. Check the headlight-switch input first to make sure a signal is present. Test the low-beam feed next and determine whether any voltage is present in the feed. If, after several tests, the multimeter does not register voltage, the low-beam switch is faulty.
Repeat the testing with the high-beam headlight switch only if the low-beam switch is confirmed to be working. If, after several tests, the multimeter does not register voltage, then the low-high-beam dimmer switch is faulty.
Headlight bulbs contain both high-beam and low-beam filaments. If the dimmer switch is not at fault, one of the filaments may have gone bad, and the bulb must be replaced.Learn More
Sylvania claims that its Silver Star Ultra headlights are the brightest on the market as of 2014, with 50 percent brighter lights than standard halogen lights. Other very bright headlights include Putco Pure Halogen Headlight Bulbs, PIAA Xtreme White Bulbs and Vision X Superwhite Headlight Bulbs.Full Answer >
To properly adjust your vehicle's headlights, locate the adjusting screws, check the suspension and the centerlines of the headlights. You need a Phillips-head screwdriver and some masking tape for this task. The adjustment must be done after dark and takes about 15 minutes.Full Answer >
Headlights are adjusted with adjusting screws. Some cars, typically Hondas and Acuras, have an adjusting bubble level that aids in adjusting the vertical aim but not the horizontal aim.Full Answer >
Clean automobile headlights using a kit from the automotive parts store. Use the abrasive to remove the clouding and yellowing of the plastic lens due to sunlight. Polish the scratches from the lens and apply the protective sealer.Full Answer >