2000 mercury cougar question?

sweat

New member
Some kind of electrical problem.
Ok replaced spark plugs, spark plug wires, battery, alternator (with voltage regulator) vacuum hose and some other parts.
Before I replaced alternator the car lights would blink very fast kinda dimming when I was driving or in park.
Now that the alternator is replaced it just does it when I am driving, like it is jumping around in voltage or not grounded properly.
Ran tests with mechanics, voltage seems fine.
They just are not sure.
ANY IDEAS WOULD BE APPRECIATED?
 
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