One headlight bright one dim - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 16 (permalink) Old 04-15-2012, 10:49 AM Thread Starter
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One headlight bright one dim

Alright, I have a 2003 Taurus LX. My driverside headlight is extremely dim but the passenger side is regular. When I unplug the passenger side to test it with a meter the driverside goes completely out. Also when I flick the high beams the driverside goes completely out. Any ideas?
Thanks, Gary

Also, I checked all wiring until the fender. It all looks good.

If you don't need both hands on the wheel, then you're not really driving.

Ford, Turning normal people into angry, flat broke ,heavy drinkers that throw tools since 1903.

-2003 LX
-1994 SHO
-1998 Ranger Sport
-1980 F-100
-1981 Honda XL185s

Last edited by Fordguy92; 04-15-2012 at 10:51 AM.
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post #2 of 16 (permalink) Old 04-15-2012, 03:07 PM
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Did you check the grounds on each side as each side has its own ground. Try running the ground for the lamp back to the battery. As for the drivers side going out when you turn on the high beam it sounds like a bad bulb on the drivers side.
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post #3 of 16 (permalink) Old 04-15-2012, 03:34 PM
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Originally Posted by calvin0325 View Post
Did you check the grounds on each side as each side has its own ground. Try running the ground for the lamp back to the battery. As for the drivers side going out when you turn on the high beam it sounds like a bad bulb on the drivers side.
Re:
Correction, this is '03.
Each light has it's own fuse and positive supply direct from the fues panel by the battery. Lights are turned on by grounding either side of the bulb by the MFS switch.

Dim one side means bad socket, or supply issue from the fuse for that side.

I do not know what year they went to double fuses, hot at all times head lamps, but my '01 has that, as well as my '03.

-chart-
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post #4 of 16 (permalink) Old 04-15-2012, 03:40 PM
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My 99 has dual fuses also....wasn't sure about yours. It also has fuses for High beams also. I have projectors in mine and with the harness I have it only connects to the drivers side socket so I have the fuses out of the fuse panel for the passenger side lamp. On the headlamp bulb connector for the 9007 bulb with the flat part facing up the center wire is ground, the left is High beam and the right is low beam.
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post #5 of 16 (permalink) Old 04-15-2012, 04:14 PM
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Originally Posted by calvin0325 View Post
My 99 has dual fuses also....wasn't sure about yours. It also has fuses for High beams also. I have projectors in mine and with the harness I have it only connects to the drivers side socket so I have the fuses out of the fuse panel for the passenger side lamp. On the headlamp bulb connector for the 9007 bulb with the flat part facing up the center wire is ground, the left is High beam and the right is low beam.
The older version had 4 fuses. Eng compartment 30A to the inside, and then inst panel fuse 10A for each bulb low, and 30A for high beams common to both sides.

Newer version has only 2 fuses, Eng compartment 15A for each bulb. No need for any fuses in cabin as only grounding done there.

Looks more reliable as a short in the wires from cabin to the front of the engine bay can only turn on the bulbs. Not blow a fuse.

Just my take. Better idea from FORD.

-chart-
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post #6 of 16 (permalink) Old 04-15-2012, 04:34 PM Thread Starter
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Thank-you. The one fuse was blown. I find having a different fuse for left and right stupid. But I guess it makes sense. Thank-you very much for the replies. I also have another question, where do you get the aftermarket headlight harness'? And about how much?

If you don't need both hands on the wheel, then you're not really driving.

Ford, Turning normal people into angry, flat broke ,heavy drinkers that throw tools since 1903.

-2003 LX
-1994 SHO
-1998 Ranger Sport
-1980 F-100
-1981 Honda XL185s
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post #7 of 16 (permalink) Old 04-15-2012, 06:20 PM
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Originally Posted by Fordguy92 View Post
Thank-you. The one fuse was blown. I find having a different fuse for left and right stupid. But I guess it makes sense. Thank-you very much for the replies. I also have another question, where do you get the aftermarket headlight harness'? And about how much?
Re:
"different fuse for left and right stupid"

It is a safety issue. Get a short in the wire, or a bulb breaks and wires short, you only loose one bulb, not both at once. Only had both lamps go out at the same time once, on a country road in a '72 Merc, and it had a breaker with a fault in it so it shut down, but recycled in a few seconds. Shut down only with brights, not on low beams. One breaker for both. Made it safely home.

Headlamps are quite important.

-chart-
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post #8 of 16 (permalink) Old 04-15-2012, 07:14 PM Thread Starter
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Originally Posted by chartmaker View Post
Re:
"different fuse for left and right stupid"

It is a safety issue. Get a short in the wire, or a bulb breaks and wires short, you only loose one bulb, not both at once. Only had both lamps go out at the same time once, on a country road in a '72 Merc, and it had a breaker with a fault in it so it shut down, but recycled in a few seconds. Shut down only with brights, not on low beams. One breaker for both. Made it safely home.

Headlamps are quite important.

-chart-

i guess if you'd put it that way yes, that is a darn good idea then lol. I just didn't happen to think of that. This is the newest vehicle I've ever owned/worked on so it's quite different! lol. But thank-you very much for the help!

If you don't need both hands on the wheel, then you're not really driving.

Ford, Turning normal people into angry, flat broke ,heavy drinkers that throw tools since 1903.

-2003 LX
-1994 SHO
-1998 Ranger Sport
-1980 F-100
-1981 Honda XL185s
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post #9 of 16 (permalink) Old 04-15-2012, 08:05 PM
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i guess if you'd put it that way yes, that is a darn good idea then lol. I just didn't happen to think of that. This is the newest vehicle I've ever owned/worked on so it's quite different! lol. But thank-you very much for the help!
Re:
"newest vehicle I've ever owned"

Welcome to the old car owner's club.

Same here.
I have '01, '02' '03 in the stable here.

Nothing wrong with older "well maintained" FORDS.

Middle one is Lin Cont, others Sables.


-chart-
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post #10 of 16 (permalink) Old 04-15-2012, 08:22 PM
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Originally Posted by chartmaker View Post
Re:
"newest vehicle I've ever owned"

Welcome to the old car owner's club.

Same here.
I have '01, '02' '03 in the stable here.

Nothing wrong with older "well maintained" FORDS.

Middle one is Lin Cont, others Sables.


-chart-
Dang, you people and your new-fangled cars....:O

Last edited by Lgbpop; 04-15-2012 at 08:25 PM.
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