Fuses or headlight switch.
What make and model car is it? If it is a mercury marquis there is a warranty on the lighting module. Usually it's a case of the regular headlights not working while the high beams (brights) still work if you hold them on while driving, but if you have a 1999-2011 Mercury Marquis, Mercury Marauder, or Crown Victoria, and your regular headlights and or tail lights don't work it probably is your LCM that used to cost around $1,000 to repair.
The good news now is that Ford just finally extended the warranty on your LCM (Lighting Control Module) for free - both parts and labor and will install a new one for free! Ford has extended the warranty to 15 years/250,000 miles. THIS IS NOT A RECALL! They do not advertise this.
Your regular headlights must not work properly in order to get a new LCM on this new extended warranty. It must be done at a Ford Dealer and the fix is free. Call your local Ford Dealer and tell them you need to make an appointment because your headlights don't work and that Ford has extended your warranty on the LCM.
They may act like they don't know what you are talking about, so tell them it is the Customer Satisfaction Program 14N01. Have your car's Vin number ready as they will ask for it. You don't have to be the original owner. If they still act like they don't know what you are talking about ask to talk to the manager or tell them to call Ford Motor Company and ask them, or you can call Ford yourself.
We had our 2003 Marquis done at a Ford dealer in August of 2014 in Scottsdale, AZ but first they checked out our LCM first to make sure it didn't work. As soon as they found out it didn't work, they installed a new LCM for free under the new warranty called "Customer Satisfaction Program 14N01".
SOURCE: dimming lights and voltage drop
Its not unusual to have a sudden drop of volts. especially if you have something running like your a/c or heater that requires a lot of power to run. it will also do it when your fan kicks in. anything that requires power is going to kick down your voltage. i would not worry about it unless the battery starts to die overnight.
SOURCE: Headlights don't work.
There is a circuit breaker inside the headlight switch body. It gets weak over time and use. The breaker is actually mentioned in the owners manual. A new switch is about $75.00 at the local parts store. You must remove the front of the dash to change the switch. Mine would go off and then in about 30 seconds reset and the lights would come back on. I would be driving down the road with my headlights flashing as the circuit breaker opened and closed. New switch = problem fixed.
SOURCE: both headlights went out at same time
Headlight switch,or dimmer switch,or the bulbs are blown,if they are blown,have the alternator checked to make sure there are no over charging going on.
SOURCE: Headlights both went out last night. High beams
There is a relay that controls the headlights, volvo calls it a step relay. You will have to check that power is getting to this relay. If not, check all fuses and wiring. If power supply checks out ok, you may have to replace the relay. Let me know if you need any more info or a wiring diagram.
SOURCE: Headlights goes out while driving down the road at
Sounds like the lighting control module is bad. You can replace it for about 400 bucks. Or you can bypass the headlight circuit to it a wire the headlights to a relay.
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