How do you know if the alternator isn’t working properly?

The engine seems to run better if I drive the car first and then start it up again later. It usually sits for a week, then I drive it for a day or two. I just got a new battery (65Ah 12V 595A/EN +30% more starting power). The car is over 30 years old.

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Mmits
1 year ago

Measure battery voltage at engine.