Question about 2002 Ford Taurus

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Head lights go out when I switch to high beam

My head light go out when I switch them to high beam. I have changed to bulbs and also the headlight switch. I have a 2002 ford Tarus

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You have a 3 pin connector at your headlights the dark green with an orange tracer should have power at all times. The light green with a black tracer is the ground to your head lights for your high beams. So when you turn your high beams on there should be a ground at the light green with a black tracer if there isn't a ground there then remove your turn signal switch and you need to check the light green with a black tracer at your turn signal switch it is a 7 pin connector and it is pin #5. If you don't have a ground coming out of pin #5 when you have the high beams on check pin #7 for a ground it is a black wire in the same 7 pin connector if there is a ground there then the turn signal switch is bad. If you want to verify that take a jumper wire while you are in the high beam position and jump the black #7 pin to the light green with a black tracer pin #5 and see if your high beams come on. Good luck finding your problem.

Posted on Apr 19, 2009

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High beam headlamps are fed by the DG/O wire and leaves on the LG/BK(at the headlamp bulb) to the multifunction switch on pin 5. The multifunction switch grounds the LG/BK wire to the black wire on pin 7 to illuminate the high-beams.

Posted on Apr 19, 2009

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Suggest you have a bad ground.
The high beam headlights draw more power, than the regular headlights do.
The ground source that you have is not enough.
Suggest you look for a corroded or loose ground connection. You may want to look, at where the wiring harness comes up from the starter, and ground leads are attached to the radiator support.

Posted on Apr 19, 2009

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You probably have a short in your wireing somewhere so when u go to turn your brights on its too much power so then they turn off

Posted on Apr 19, 2009

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Low beam headlights do not work, but high beam headlights do


Clyde,

I've been troubleshooting this same problem on a different vehicle this week, and I can give you the steps I'd take.

1. If both sides went out at the same time, the problem is *NOT* likely to be the bulbs.

2. Check the fuses to see if both low beam lights are on the same fuse. Many cars have one fuse for low beam and another for high beam, so both lights out at the same time typically means fuse blown.

3. If the headlights are OK and the fuses are OK, then the problem is *LIKELY* the headlight switch. In my case, AutoZone has one and it can be installed easily; but in your case, that may not be as simple.

Please post your findings or comments.

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