Question about 2003 Mercury Grand Marquis

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Head lights go out while driving--not a short but possibly sensor in headlight

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This is caused by a burnt connector at the headlight switch, replace the switch and the connector to it, make sure the repair connector is properly soldered in and shrink tubed at the connections or the new connector will overheat again, this is a common problem.
here is the Ford part nunmber and price, which is the cheapest for the part.
MOTORCRAFT Part # SW6703 {#8W7Z11654AA}
Includes Thumbwheel Rheostat $34.79

Head lights go out while driving--not a short but - 33ccb4c.jpg

Posted on Sep 15, 2010


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u can use a headlight to find the short use a old style headlight usually 3 prongs use some 14 guage wire and hook to prongs to head light and run the other end of the wires where efi fuse goes turn key on the headlight will light up as long as there is a short , u can then start wiggle wiring or unplugging engine sensors till headlight goes out when it goes out you have found the short

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