Electrical problem
2001 Dodge Intrepid 6 cyl Front Wheel Drive Automatic 74000 miles
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The LEDs showing milage, radio staion, and gear selector on the dash board blink bright and dim when I have the headlights on. This happens intermittingly and after a few miles of driving, it quits. I thought maybe the alternator was going bad because a previous car I owned did a similar thing (Olds Delta 8

. I had it checked and was told that the alternator was ok. What is this car trying to tell me or is it just a short.
Thanks, Brian