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Thread: Question about headlights

  1. #1

    Default Question about headlights

    Attn all motor people,

    If both your headlights go out at the same time, which is it most likely to be, the bulbs or a fuse? Which would you do or check first?

    Thank you.

  2. #2

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    Usually, each light is protected by its own fuse. It would be unusual for both lights or both fuses to fail simultaneously. However, both lights are controlled by a single relay. I would put my money on the relay.

  3. #3
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Cookie View Post
    Attn all motor people,

    If both your headlights go out at the same time, which is it most likely to be, the bulbs or a fuse? Which would you do or check first?

    Thank you.

    That depends on the Model that you have.

    Could be OP error. lol

    Happy New Year Cookie.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  4. #4

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    Wise guy, it is not OP error, lol.

    The relay is a fuse as well? Will Auto zone put it in you think?

    Happy new year Don.

    (this is son's car, so not sure of the model) It is little and red. lol.
    Last edited by Cookie; 01-03-2012 at 10:50 AM.

  5. #5
    DIY Senior Member Chad Schloss's Avatar
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    could be a relay. my grandpa drives a 2000 something mercury crown vic. all lights go through a module under the middle of the dash. Module to replace (because they say it is non repairable) is almost $600. I fixed it for $5 bucks after I took it apart and resoldered a relay. This time I used a better relay and remotely located it so it can be replaced if necessary.

  6. #6

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    Quote Originally Posted by Cookie View Post
    The relay is a fuse as well? Will Auto zone put it in you think?
    A relay is not a fuse. Usually the relays are located in the engine compartment in a self-contained compartment with a plastic housing. You'll find fuses in there as well. If you look at the inside of that plastic cover it will show you where the relays are located.

    The guys at the local Autozone should be helpful in identifying and replacing the relay.

  7. #7
    Jack of all trades DonL's Avatar
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    Auto Z will check it out for free.

    If it is American made depending on the year then the Rear Tail lights may be out also.

    If it is a fuse then there is a reason that it blew.
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

  8. #8
    DIY Senior Member Chad Schloss's Avatar
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    did he install a radio recently? maybe cut some wires under the dash he wasn't supposed to? lol seen that a lot when I used to install car stereos, alarms & car starters when I was younger.

  9. #9

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    I am doing my mom thing. I will tell my son about the relay, thank you so very much. I did ask him, about the back lights and he said, they are working, turn signals, the works, just the headlights aren't working. If a fuse, wouldn't a fuse blow just because the fuse went bad? Bad fuse?

  10. #10

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    Oh, boy... you might had hit on something with the radio. I will have to ask him about that one. He only has a small cassette player in this car, and, he wanted a CD player.

    He was talking about installing one.

  11. #11

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    I bet he did.

  12. #12

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    His dad could build a car, a hybrid, better than a car manufactuer. He could fix this in a heart beat. lol.
    Last edited by Cookie; 01-03-2012 at 01:23 PM.

  13. #13

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    Nope... he didn't do a radio or CD player, still listening to the cassettes and hating I am sure, every minute of it. So, scratch that idea.

    I wish things while I was growing up were different for girls with fixing cars. The interest was not encouraged for it. If I had a daughter, I would really encourage her to take classes in mechanics. At least to do the basics.
    Last edited by Cookie; 01-03-2012 at 11:30 AM.

  14. #14
    General Engineering Contractor ballvalve's Avatar
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    The headlights that I know have to be on a relay that automatically resets, so you get a few more on off cycles of the lights at night so you can get off the road. No fuses for Headlights anymore. Probably a bad relay.

  15. #15
    Jack of all trades DonL's Avatar
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    Quote Originally Posted by Cookie View Post
    I bet he did.
    What did he do ?

    He must of had a Girl in the back seat, Smashed a wire from all the bouncing, Blew the fuse, and could not drive home.


    Sounds like a story that my boy would tell, After being out on a date with a Hot Chick.


    Ask her what really happened. She may say, "I just hit the gear shift knob" But she knows what really blew his fuse...
    Theory only works perfect in a vacuum.

    Cyber Security Protection for Windows C:\ > WWW.WinForce.Net

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