Battery Light Came on

Any car that uses a smart charging system will have the voltage fluctuate between 12 -16v depending on load and battery charge level, the 14v thing was the case in the 90s but many cars have now moved away from that

Probably gone again if cheap parts was used

The risk you face is been stranded if your battery runs flat. Less of an issue with diesels which can run off their own momentum - but I once had the light go out even though the engine was still running. With the prevelance of everything electric you are unlikely to be so lucky.

What your indicator light is most likely reading is a low battery voltage, it might only be a momentary droop but once the ECU sees it then it will log a code and keep it untill it is cleared and the issue is resolved. Without a meter to check the voltage it's all guesswork however.

Have you got a basic code reader to check the error ?

Are there any funny sounds coming from the alternator ? A failed alternator clutch might load the engine down and cause the belt to slip/screech.

Not an rtx brand anyway, guaranteed premature failure 😅

Are you 100% sure it was the alternator that was replaced in Nov 22 and not just the alternator belt? Typically it'd only be replaced on failure i.e. you'd have been having battery issues at that time

Any chance it'd be the battery?

€400 sounds too cheap. I remember years back probably 10 years ago 1994 Toyota diesel and motor factor was 300 or 400 just for alternator. I think problem here is cheap alternator

What was the result ?

Its entirely possible when the alternator was replaced, it was eithre just reconditioned or replaced with a reconditioned one

So.e lads will find the brushes are gone and just do that. Rest of alternator is not touched.

Price wise i paid a motor factors 350 for one for a B8 A4 cause i was stuck.

Found the same one online for 180 delivered