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ford fiesta 03 lights fluctuating?

my ford fiesta 03 has an intermittent fault of all the lights getting brighter and duller but not actually going
off---head-side-interier-&dashboard lights,
this happens with the engine running or turned off.
the speedo & rev counter will suddenly go crazey for no reason.
a new alternator has just been fitted & the battery tested.
help!!
david k, May 2011
sounds like a voltage regulator is giving up the ghost,or a bad earth to body of the car,

mm, May 2011
link Click here to see other fixes for Ford Fiesta.