Question about 2005 Ford Mustang

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Headlamp problem Hi, wonder if anybody can help before I pull the rest of my hair out! Drivers side headlamp goes out after 10/20 seconds each time I switch the headlights on, fuses OK, Relays seem OK, swaped bulbs,

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This can be a tough one.See the headlamps are controlled by the smart-junction box. Power to the headlamps are send from the smart-junction box to the headlamps than back to the bussed electrical center(under hood fuse panel.
Now what exactly is effected by this low beam or high beam or both?
If it is both then your problem is most likely at the bussed electrical center.It provides the ground to the bulbs and both high and low beam share the same ground. If this is the case you should be able to check for power at the bulb and if you have it there then jumper you a ground to the BK wire on the bulb and see if it lights up. If this is the case then go to the battery junction box and disconnect the last connector closest to the firewall and clean it with electrical cleaner and blow dry it,make sure it is good and dry before hooking back up.
If you do not have power to the bulb then your concern is at the smart junction box and it would not be wise to mess with it. See it is a programable module and it also controls pats system so if you disconnect it well you may be stranded and will have to have it towed to the dealer to clear pats or reprogram it.
Hope this helps.

Posted on Feb 03, 2009

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Hi
You will have to get your 12v test light out, and work back from the head lamp bulb plug, to see if you are loosing the live feed, or the earth.

Good Luck !

Don´t forget to give me a FixYa Please !

John

Posted on Feb 03, 2009

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