One headlight bright one dim

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You're reading: One headlight bright one dim

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discussion starter · #1 · apr 15, 2012 (edited)

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.

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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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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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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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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.

Read more: How much does it Cost to repair Car Headlights?

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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discussion starter · #6 · apr 15, 2012

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?

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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?

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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discussion starter · #8 · apr 16, 2012

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!

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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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all i can say is new and old are very relative terms!

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all i can say is new and old are very relative terms!

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” new and old are very relative..”

good, now i am “relative”.

my grandsons tell me i am older than dirt.

it’s all relative to grade school age kids.

-chart- (the old coot)

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my grandson thinks it’s funny i still drive the car his mom and uncles learned to drive in.:rolleyes2:

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i have the same problem, one headlight dim while the other is bright. i switced fuses and still, same headlight is dim and the other bright. i looked at chilton’s schematic and it shows a separate ground to each light. question is, do most people clean the ground first or should i be checking the wires to see the power to the light. what should the power to the light be?

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ideally you should have battery voltage going to the headlights. but with normal wiring drops it might be slightly less. if it’s more than 0.5 volts lower with the lights on then you can suspect a wiring supply issue. but with one light dimmer i would be checking my grounds first.

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2 posts

drivers side head light dim

similar to others on this thread, i have a drivers side head light that is dim. i replaced the head light assembly and have put a new bulb in. no change. i checked the fuses in the engine compartment fuse block and both are good. however, when i remove the fuse for the drivers side headlight, both headlights stay on. but, when i remove the fuse for the passenger side headlight, both lights go out. from reading a number of posts, it seems to be a ground problem and the grounds are switched by the main switch and the multi-function switch. is there anyway to test which of the 2 switches is causing the problem?

thanks,

2000 ford taurus ses 3.0 duratec

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Category: Headlights