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Ford F-250 Super Duty Fog Light

How and Why Ford F-250 Super Duty Fog Lights Go Bad

While they aren't very useful in clear weather, fog lights are extremely handy in situations where heavy precipitation or other road conditions make it difficult to see past your hood. By helping your eyes find the edges of the road, the lane markings, and generally lighting up the ground ahead, these specialized lights help you avoid disaster that could cost you your truck--or even your life. Inevitably, however, wear and tear will cause problems. Here are some examples of how fog lights malfunction and why:

Puddles of water and other signs of exessive condensation

Large amounts of moisture can result in rusted connections and, in the worst case, exploded bulbs. The exterior lamps on your F-250 truck are vented to allow for normal changes in pressure. A side-effect of this is that moist air can enter the assembly through the vent, which can form as mist on the interior. Thin, fine mist is fine and will eventually disappear by itself. Watch out for large water droplets, drip marks, and puddles inside the lamp. The probable cause is a plugged vent. Most vents can be found near the bottom-rear of the fog light assembly. Some fog lights have a blue material that acts as a kind of filter for the vent. It may help to remove the filter altogether.

Dim or non-functional lighting

It's always a good idea to check the bulb first. Carefully disconnect the fog light bulb and test it with a 12 volt source, such as your car battery. If the light is dim or it doesn't light at all, then you've found your culprit. If it works fine, then the problem likely lies in a poor circuit connection or a bad fog light switch. Check the wiring for anything loose or corroded. Also check for voltage continuity using a test light (with your owner's guide as a reference). If the connections are good, have a look at the switch. The bezel that holds the headlight rotary switch can be pulled right out of the panel which allows for easy tinkering with the circuit board. There, you can check if the spring-loaded rotary switch is dirty or stuck.

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  • How to Make Your Ford F-250 Super Duty Fog Lights Last Longer and Work Better

    While the weather may be beyond your control, your truck has features that help ensure your vision on the road and whatever is in your path. In extreme weather--such as heavy fog, rain, and snow--headlights might not be enough. This is where fog lights come in. Some trucks, such as the Ford F-250 Super Duty, have them built-in; even then, it's not a bad idea to install fog lights that are easier to adjust. (You'll see why later.) Here are some tips on how to get the most out of them:

    Install a protector.

    Fog lights are, by necessity, positioned close to the ground. On a Ford F-250 Super Duty, for instance, they are housed in the front bumper. Protect them from scratching and cracking by installing a protective cover. You can get high-quality urethane coat for about 70 USD. Some DIY auto enthusiasts even go as far as to install a wire mesh between the housing and the lens.

    Keep the lamp right-side-up.

    Most fog lights have a vent that keeps moisture from building-up in the assembly. This little hole is supposed to face downwards to allow any build-up to drain out safely.

    Clean the lenses regularly.

    A thin film of your regular road dust can reduce your fog light's effectiveness by half. Snow and mud can be much worse and even totally block the light.

    Mind the connections.

    A connection that's loose or dirty will can cause the one or both of the fog lights to work at less than 100%, or even not work at all. If you're installing new fog lights, keep the wires, relays, and fuse boxes away from hot areas and moving parts.

    Mount them securely.

    A loosely mounted fog light won't stay in place for long. It'll dance at every bump and you won't get light in the right places. Make sure the mounting is rigid so the beam stays where you want it to be.

    Aim them properly.

    To avoid glare, fog lights should be aimed straight ahead, even lower if the weather is particularly bad. It should illuminate the road right in front of you and avoid lighting up the fog/rain/snow at your eye level. Another good idea is to cross the beams, with the right fog lamp pointing left and vice versa. This gives you a wide spread of light on both sides while doubly illuminating the front, where the light is most needed.