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Head lights and instrument panel lights going from brite to dim.

(1999 Ford F-150)
in Beallsville, OH on December 31, 2014
just started tonight, did it all way home 30 mile, not because of bumps. Did it
at random. Affects all lites.
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Popular Answer
on January 01, 2015
Have alternator output tested... Also possible ground circuit issue... How about gauges, any fluctuation in those when turn lights on/off?.. Try it and see if gauge needles for oil pressure & temperature move erratically with each light switch cycle!!
Post results..
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