Both Low Beam Headlights Dead At the Same Time? [Archive]

what do i do when both headlight goes out


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Both my low beam headlights stopped working at the same time this evening. High beams are still fine.

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I’ve never seen two headlights go out at the same time. Before I go and replace them, what are the chances that there is something (relay, etc) broken in the electrical system?


Tye 1on

+61404532026, 08:42 PM

Definitely the switch.

In my typical brilliance I put one bulb in upside down when I replaced the pair. It was fucked, driving onto snowstorms was brutal, and when I hit the brights it went down a level. Spun it 180, was fine.

You could replace one (cheaper) bulb first to test whether it is the switch.


XXX-er

+61404532026, 09:00 PM

I agree but both bulbs COULD have gone at the same time

what kind of headlight, do you just change a bulb or a complete sealed beam or what ?

If you have an ohm meter you could check the bulb or bulbs to see if you got continuity

If you don’t know what is fucked figure out what isnt fucked, swap parts for PD and do the easiest/ cheapest thing 1st


Definitely the switch.

In my typical brilliance I put one bulb in upside down when I replaced the pair. It was fucked, driving onto snowstorms was brutal, and when I hit the brights it went down a level. Spun it 180, was fine.

You could replace one (cheaper) bulb first to test whether it is the switch.

Thanks. When you say switch, do you mean something like this? http://www.partsgeek.com/catalog/2002/nissan/xterra/body_electrical/headlight_dimmer_switch.html

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I agree but both bulbs COULD have gone at the same time

what kind of headlight, do you just change a bulb or a complete sealed beam or what ?

If you have an ohm meter you could check the bulb or bulbs to see if you got continuity

If you don’t know what is fucked figure out what isnt fucked, swap parts for PD and do the easiest/ cheapest thing 1st

I think it is just the bulb from when it was replaced last time. Can you tell me what PD stands for? Not following that part.


XXX-er

+61404532026, 09:37 PM

Problem Determination

What i learned from 30 yrs of teching is when you are charging people a lot of money you wana use a lot of acronyms … sometimes I even made them up


Micol

+61404532026, 09:22 AM

I made a sharp turn in a 08 subaru into a parking space while turning lights off at exact same time and it blew both high beams. I either replaced a fuse, relay or the bulbs, cant remember but it was weird like that


My Pet Powder Goat

+61404532026, 10:09 AM

Could it be a blown fuse? (VW of course)

My friend just had this happen to her last night, her high-beams work but not low-beams.

Which is fine because her high-beams look good….when she’s naked!


dewam

+61404532026, 11:01 AM

There are many things that can cause your “both headlights” problem, but I have found the most common to be that both headlights are burned out. Sounds simple doesn’t it? The usual way it happens is one light burns out, you don’t notice, the second light burns out, now you notice. Get the multi meter out and chase some electrons, if you don’t know how then try replacing one bulb.


Moose Pit

+61404532026, 02:18 PM

Had it happen in my VW van, replaced the switch and I was good to go.


‘ had both low beams fail myself ;

Replacement lights working fine many years later .

It Could be something more, but a replacement light seems like cheap diagnostics ( one side, Good > the other side, Good and leave it. replace the first side, End. ) .

someThing more nefarious you can chase Forever …

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good luck. J


… The usual way it happens is one light burns out, you don’t notice, the second light burns out, now you notice…

Yep.

Low tech trouble shooting: Remove a bulb, examine it for burnt out filament.

Or is this an old style all-in-one headlight?


philth

+61404532026, 12:56 PM

Hey, whats the car? or did I miss that?


rainier

+61404532026, 02:49 PM

Had this happen on an 06 outback. Both burned out at the same time, replaced both 2yrs ago, still going strong. Worth the $20 to see if it’s a simple fix.


karpiel

+61404532026, 04:35 PM

Fact that it’s a Pathfinder makes me think switch, they seem to go more frequently than most.


XXX-er

+61404532026, 07:13 PM

so now what?

If you don’t have a way to test the low beam circuit (you can probably see a missing/blown filiment) bulbs for continuity do you buy a switch for $$ which will be hard to change & you usually can’t return if its not the problem OR do you buy one bulb and swap it which is cheap & easy ?

I always do the easiest thing 1st, even if a repair manual sez its probably the hard to change part I always try the easy to change part 1st cuz I’m Lazy

Lazy techs and software writers always know the easiest way to fix something


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