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How do i know if headlight blown is a fuse or just a blown bulb, or needs wiring

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SOURCE: trying to fix the wiring on headlight

try checking the ground wire on the frame next to the head light if you have a volt meter measure voltage on the hot side, if there is 12 volts then measure it on the ground side, is it lower than 12 volts? if it is you have bad ground strap follow the wire it will be near the radiator core support and sand it off if that does not help then it's in the light switch.

Posted on Jan 19, 2010

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The parking lights go on but headlights won't


The parking light may go out if both headlights are out, depending if they're wired to the same fuse. It sounds like there may be a blown fuse in the dash, take it in to mechanic and it should be a quick fix Wiring harness has come loose, blown bulbs, or bad wire.


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Dec 20, 2012 | 2003 Mercury Grand Marquis

1 Answer

All exterior lights work but not the headlights


I would try the fuse panel, usually the headlights have their own fuse, if it isn't blown headlight bulbs then take off the plug to the rear of the headlight and stick a multimeter set to 20 volts DC in the plug and turn the headlights on to see if you are getting a reading, if you do than it is a blown bulb. if no current than try testing the fuse plug in the fuse box with the lights on to see if you get a reading if you do get a reading than you know its a faulty fuse. if no luck with both of them than it may be a more serious electrical issue which needs to be addressed by a auto electrician.

Oct 09, 2012 | 1989 Ford Ranger

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I have a chevy s10 2002,the headlights do not turn on, the high beam works fine, bulbs are fine. thanks for help


If it's not the bulbs, be sure to check them, might be dual filament and the high beam wire is fine but the headlight one is shot, one bad wire would cause both headlights not to work.
Hopefully that's the problem, if not, it could be blown fuse/short in the wire. Try checking power/ground at the bulb to reduce the possible problems. If it has both with the headlights "on" then it's the bulb, if it's missing one then follow the wire for any irregularities.
They sometimes pass the wires under the flooring right near the drivers feet, which is a perfect place for water/salt to seep in and corrode wires.

Feb 07, 2010 | 2002 Chevrolet S-10

2 Answers

ONE HEADLIGHT WORKS ONE DOESNT WITH METER ONE RED WIRE HOT OTHER NOT THEN WITH HIGH BEAM NONE HOT GOOD GROUND WITH METER


Is this a two bulb system? Then bulbs have 2 filaments which share a common ground. 1 wire hot on low, second hot on high. If you are having problems with both then the ground is bad. When you checked for ground with the bulbs plugged in, there is a ground path through the filament across the harness, through the other bulb filament to ground. When you see cars with one very dim bulb on one side this is the problem. Clean the ground wires on both sides where they are bolted to the fender or radiator support.

Feb 05, 2010 | 1987 Nissan Pathfinder

1 Answer

NO LOW BEAM, EVERYTHING CHECKS OK . I HAVE CHECKED ALL BULBS AND FUSES


Hi,
The simple answer may be that the low beam side is burnt out. Replace the bulb.
However, if both headlights have stopped working when switching to low beams, there may be a problem with the relay or the switch itself. If the cost of a relay is low for your car, it may be less expensive to simply replace that component than to have it diagnosed in a repair shop. Replacement of the switch requires some disassembly of the steering column or dash in most vehicles.
This is how to fix the low beam..
1.Check your fuses. The plastic panel covering the fuses should have a diagram detailing what each fuse covers. If yours is missing, or unlabeled, check your owner's manual, or a Hanes(tm) or Chilton(tm) repair manual. Often if a headlight is not working, it is the result of a blown fuse. Fuses have a wire running through them that will melt when too much current is run through them. If the fuse is blown, the wire will be broken. If the fuse for the headlight you are working on has an intact wire, it is likely the problem lies elsewhere.
2.Swap the headlight for its twin. If your left headlight does not work, put the light from your right headlight in its place. If it works with the other headlight in place, your headlight bulb is dead, and needs to be replaced.
3.If this does not work, try using a voltmeter on the plug for the bad headlight. Turn on the ignition, and turn the headlight switch. If the voltmeter shows no current, then either your switch or the wiring leading to the headlight has gone bad.
4.If replacing your headlight switch does not solve the problem, then there is a break in the wiring leading to the headlight, and the wiring will need to be replaced.
Thanks for contacting fixya.com

Nov 11, 2009 | 2002 GMC Yukon Denali

1 Answer

1997 turned headlights on and had no lights low or high beam


If I'm correct, that year range had sealed beam headlights. Either way, first thing I would check would be the fuses. A blown fuse explains no hi or lo beams pretty well. After ruling out any fuse issues, check the bulbs to see if they are blown - not likely both would go at same time but not impossible. Fuses fine and bulbs fine, issue has to be somewhere in wiring harness. That is the worst case scenario since you'll need a multi-meter and a ton of time.

Sep 28, 2009 | 1997 Dodge Ram 1500 Club Cab

1 Answer

All running lights work but head lights don't


blown out headlight bulbs or headlight bulb fuses. If this isn't it, have the mechanic wire the headlight wires to the running lights, simple quick fix, but recommend installing a high fuse for the extra load. Charles H.

Aug 21, 2009 | Audi A4 Cars & Trucks

1 Answer

Fuse panel


Unfortunately this is not a fuse issue. It would be if both headlights were blown. The fuse controls both headlights not just the one. I would be inclined to think either a.) you may have gotten a bad bulb from the store. or b.) you have a broken wire somewhere or c.) a ground wire broken. I would try replacing the bulb again just to eleminate that being the problem (and if its not you got a spare bulb just in case then) and go from there. Good luck and thanks for using fixya!

Sincerely,

JC

Jan 22, 2009 | 2001 Ford Taurus

1 Answer

Lighting systems


Dear Sir/Madam,

  1. Check your fuses. The plastic panel covering the fuses should have a diagram detailing what each fuse covers. If yours is missing, or unlabeled, check your owner's manual, or a Hanes(tm) or Chilton(tm) repair manual. Often if a headlight is not working, it is the result of a blown fuse. Fuses have a wire running through them that will melt when too much current is run through them. If the fuse is blown, the wire will be broken. If the fuse for the headlight you are working on has an intact wire, it is likely the problem lies elsewhere.
  2. Swap the headlight for its twin. If your left headlight does not work, put the light from your right headlight in its place. If it works with the other headlight in place, your headlight bulb is dead, and needs to be replaced.
  3. If this does not work, try using a voltmeter on the plug for the bad headlight. Turn on the ignition, and turn the headlight switch. If the voltmeter shows no current, then either your switch or the wiring leading to the headlight has gone bad.
  4. If replacing your headlight switch does not solve the problem, then there is a break in the wiring leading to the headlight, and the wiring will need to be replaced.
Thanks
Good Luck


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May 28, 2008 | 2005 Jaguar XJ-Series

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