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4, New alternator installed and tested:
I left my car at the workshop and pick it up the day after.
The new alternator installed and looking good.
When cranking up the engine the red battery alarm was gone.
And last a voltage check, normal voltages are about from 14.2 to 14.4 volts when car running at idle or 1500 rpm and no excessive electric load. I read 14.5 volts, it's a cold day and then the regulator puts in some extra 0.1 volt. If it reach more then 14.6 volts for longer time, then it's something wrong. Leave the car to a workshop.
As I wrote in the beginning, this was a risk that I took to just order a new alternator before checking everything that could have been wrong. Cables that are loose, bad ground connection etc. But I did a visual check of that.
If you want to go deeper into it maybe these links I found could be useful:
Does it sound complicated? Then leave the car to the workshop, don't risk to destroy your car.