Turn on the lights and determine which headlight is burned out.Figure out what kind of headlight your car uses. Some cars have a replaceable halogen bulb inside the headlight. On other cars, you need to replace the entire headlight.Buy the headlight or bulb you need at an auto-parts store. The salespeople can help you find the right headlight or bulb for your car. The procedure differs depending on what type of headlight you’re installing. Install a New Halogen Bulb Step1Open the hood and find the wires that go into the back of the headlight.Step2Twist the black plastic ring at the back of the headlight to release the bulb.Step3Pull out the bulb and unplug it.Step4Carefully take the new bulb out of the box without touching the glass part with your fingers (see Warning). Plug it in and place the bulb back into the headlight.Step5Twist the plastic ring back on and test the new headlight. Replace an Entire Headlight Step1Unscrew the tiny screws that secure the thin metal frame holding down the headlight. Do not turn the ones that have little springs behind them (see Warning). You may not need to take out all the screws to remove the headlight; sometimes you can leave the frame hanging by 1 screw.Step2Put the screws in your pocket.Step3Pull out the headlight and unplug it.Step4Plug in the new headlight.Step5Turn on the headlights to make sure the new light works.Step6Put the metal frame back on and screw it down. A magnetized screwdriver will will make it easier to hold the screws in place. Locate the Bulb Holder With the hood propped safely open, look around to the back of the headlight and locate the bulb holder. It will have three wires coming out of a plug that is shaped like a trapezoid. Remove the Wiring Harness The three wires are attached to a plug that is at the base of the headlight itself. This plug will be held in by a plastic catch, a metal clip, or in some cases a screw cap. For a plastic catch, you’ll see a little lever sticking up at the top of the plug. Press this down with your thumb while you pull firmy but gently on the plug. It should slide off. For a metal clip, just pull up and away and it will come off in your hand. Try not to drop it, when these things hit the pavement the clips are like stick-bugs in the woods, hard to see. For a screw cap, simply unscrew it by turning it counter-clockwise (the old righty-tighty/lefty loosey might get confusing since you are doing the reacharound.) Remove the Old Bulb With the wiring out of the way, you should be able to pull the bulb out by holding onto the base (the thing that the plug was in). In some cases, you may have to rotate the bulb Put the New Bulb in Place Before you take the new bulb out of the packaging, grab a tissue or a clean rag. If the oils on your skin get on the glass bulb, it can burn out prematurely, in some cases the same day. If you must touch the glass, do so with the tissue. You shouldn’t have to.Holding the bulb’s plug end, stick it into the back of the headlight. Be sure to visually confirm that it’s all the way in. You can tell because it will be lined up evenly and none of the bulb’s rubber gasket will be showing. Category:Home › Autos • Will the trend toward economy-size car models lead Americans back to buying smaller-sized cars? — part 2 • You should never use after-market auto parts when maintaining or fixing your car • Should a new car be rust-proofed? • Will the trend toward economy-size car models lead Americans back to buying smaller-sized cars? — part 1 • Five safest cars in North America • How to ensure your teen drives safely after getting a license • Pros and cons of using an hydrogen generator for your car • DIY automotive maintenance: How to change the oil