Re: lights flicker upon startups- '04 Blazer
This most often points to a voltage regulator issue. Of course it's in the alternator, before you buy a new alternator try checking all the connections to the alternator including the plug and the wire(s) in it.
With a fully charged battery I would disconnect the alternator wiring and start the car to see if the flickering happens. This would isolate the alternator from the system as a cause.
You most likely will see some codes relating to no charging but they can be reset.
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VetteVet
metallic green 67 stepside
74 corvette convertible
1965 Harley sportster
1995 Harley wide glide
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