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VW Fox 2010 1.2 not enough current for battery

So I have recently bought VW Fox 2010, 1.2 engine. After few days, the engine wasnt able to start so we have replaced old acumulator / battery for the new one and we was informed that alternator is not working correctly - it was making 13.7V instead of 14.4V

So we have drove to mechanic and he tried everything, he replaced used parts of alternator, tried other alternators and still same thing.

On cold engine, everything turned on, I got 14.4V but when engine gets warm it drops to 13.7V and it stays there. So does anyone have faced similar problems?

One more thing, computer doenst give us any errors.

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Your charging system sounds normal. I suspect either your battery is dying or car’s electronics have a parasitic drain in one of the circuits when the car is turned off and parked. You will need to have someone check that with a suitable DC ammeter to find out if that is the case. I am afraid you wasted money on the alternator repair. Clamp on ammeters suitable for this testing are not cheap… https://www.omega.com/pptst/HHM-MA1500.h... but then again neither is wasting money on unneeded repair work. Sorry to deliver bad news. Good luck finding reliable shop to address the real problem. You should probably have that battery tested for capacity first before looking for a drain when car is parked.

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