The fog lamps in my SUV are having a problem. The fuse isn't blown, so I went ahead and replaced the bulbs. When I start my vehicle and pull the fog-lamps knob, the light on the knob glows. I've tried numerous fixes, but none of them worked. What do you suggest that I do?
It sounds like it is very possible that the fog light relay located in the central junction box is faulty. As long as the foglight switch is trying to activate the relay, then replacing the relay should restore light operation assuming there is no issue with the fuse. You may want to enlist the help of a mechanic, such as one from YourMechanic, who will have the equipment and expertise to troubleshoot the fog lamp circuit.
How to Identify and Fix Common car Problems ?
Our sources include academic articles, blog posts, and personal essays from experienced mechanics :
Blown Fuse: As a first resort, many mechanics will inspect your fuses in the event an electrical component, like the fog lights, fails. When a fuse blows, it prevents the circuit from completing and will not allow the lights to turn on. Burned-out Bulbs: Over time, bulbs will wear out and will stop working.
One of the first symptoms of a problem with the fog light relay is an audible clicking noise from the relay. Many relays will produce a quiet audible click when they are switched on, however, an excessively loud click may be an indicator that the relay may be having internal issues.
The most common location of the fog light relay is in the underhood fuse and relay box. The underhood fuse/relay box can be mounted in any of several different locations under the hood. It can be mounted on either the driver or passenger side, and either the front or rear, of the engine compartment.
Yes you do. The relay is there to turn the fog lights off when you switch on your high beams. In most states it is illegal to have your fog lights on while using your high beams.
Used in “flip-up” lights, which fold out of the body of the vehicle, headlight closure relays are essential for headlight operation. This relay is located in your main fuse box or panel.
It is fuse# 43 and it`s a 15A. The direction says to replace the one provided, which has the # 15 on it.
The fog light relay is used as the switch to turn them on. As soon as you flip this switch on, the power is sent to the lights. Thanks to this relay a low voltage fog light switch is possible. This relay should last the entire lifespan of your car, but sometimes things can happen and it will need replacing.
The difference is that fog lights must only be used during bad weather conditions where visibility is poor and daytime running lights allow the vehicles visibility for others during daylight.
Relays are switches that open and close a circuit when actuated with an electrial signal. An example of this is your driving lights turning on with your highbeams (assuming you have your separate driving light switch enabled).
Don`t forget: Fog lights will only work when your dipped beam headlights are turned on, so make sure you do that first before driving in fog. It`s important that you don`t turn your rear fog lights on any earlier than you need to, because you could end up dazzling any drivers behind you.
LED lights do not need relays to operate. Yet, doing so is not recommended. It is best to use a relay when you are unsure about switches, fuses, and wiring is of the proper size for the amperage.
Yellow lights are the best among fog light colors because they hit your retina in a way that enables you to focus on the road. Staring constantly at white light can frustrate the eye, and darker colors like blue and green have limited wavelength.
One of the most common situations that require the use of a relay occurs when an application needs to switch from high to low current (or vice versa) within the same circuit. For example, the temperature sensors that power HVAC units require levels of amperage that vastly exceed the capacity of their wiring.
The two most common failure mechanisms of relays are contamination and mechanical wear of the internal switching elements discussed as follows: a. Contamination is a major cause of early life failures.
The likely cause is a fuse, headlight relay, headlight switch, dimmer switch or a wiring fault. About the only cause that is an easy fix is a blown fuse. Consult your owner`s manual to locate the main fuse for the headlight circuit and replace that fuse with one having the same amp rating.
All the electrical systems in your car, including the headlights, are protected with fuses. These are designed to `blow` and break the circuit if too much power comes through them. This protects all the components on the circuit.
A lighting circuit is protected by a 5- or 6-amp fuse or circuit breaker. This fuse size allows bulbs with a maximum combined wattage of 1150 watts (5 amps x 230 volts) or 1380 watts (6 amps x 230 volts) to be run off the circuit.
The lighting circuit uses a fuse of capacity 5A. Fuses are deliberately the weak link in a circuit and will `blow` if an appliance or cable draws too much power, to prevent a fire occurring.
In the world of DC electronics, the accepted wiring convention is that the red wire carries the positive voltage, and the black is circuit ground. Usually the red is marked as + (plus) and the black is marked as – (minus).
The red wire is positive. The black wire is negative. The white wire (if present) is ground (sometimes called neutral in DC). If both wires are black but one has a white stripe, the striped wire is negative, while the plain black wire is positive.
The only tool required to check a relay is a multimeter. With the relay removed from the fuse box, the multimeter set to measure DC voltage and the switch in the cab activated, first check to see if there are 12 volts at the 85 position in the fuse box where the relay plugs in (or wherever the relay is located).
If your car`s fog lamp indicator light has appeared on your dashboard, that means your fog lights have been turned on and are ready to help you handle low-visibility driving conditions.
The symbol for the front fog lights, as stated above, is an oval-shaped lamp with three diagonal lines intersected with a wavy vertical line to the left of it. The symbol for the rear fog lights is an oval-shaped lamp with three horizontal lines bisected by a wavy vertical line on its right.
So while some fog lights do produce selective yellow light, many produce white light. It`s actually the bar-shaped beam of light, and the way that the beam is aimed, that makes a fog lamp a fog lamp, rather than the color.