2018 Golf 7.5 GTI performance - Alternator failure

[Wish]

Hi.

Son’s Golf GTI performance alternator seems to have failed.
Car has some 38k FVWSH he heard a bag the other days. When we opened the bonnet we could see spots of grease over other nearby parts, the car gave a warning of battery not charging. So assume it’s the alternator.

Any one know If this is a common problem, and how much it would be for a new one Vs non genuine.
Wasn’t planning on changing it, as he moves in to his new house today so wanted to run the car for a few more years.
He’s owned it for 5 years and apart from general servicing and wheel corrosion it’s been a good car.

Many thanks

[Belle427]

Check the drive system first, belt and particularly the pulley.

[Wish]

Many thanks

[Dr G]

Belle427 said:

Check the drive system first, belt and particularly the pulley.

Agreed. And no, alternator failure not common.

[Wish]

Thank you for your input. You were correct it was the lower pulley.
All replaced and back with my son.