Most likely, since the OP wasted probably almost twice the money on an AGM then the correct battery costs, they are in denial about It being the problem. Notice that they completely blew past that possibility.Me thinks the AGM battery is the problem.
Paying dealer prices, Literally half the cost anywhere else (for a non OEM part) but its a lifetime warranty!Regulator faulty, $145 from dealers. Alternator working properly again.
To anyone that needs one,the dealer does sell them separately but will try to sell you complete alternator for $690
Again in plain English-problem started with OEM battery. The OEM battery is still good.AGM was NOT the problem. It never was. It was a spare meant for my other TDI. I didnt go out to buying it for mine.
The title asked about warranty , not diagnosis.Bye
Advance auto, life time warranty, in stock, $62 usd after stacked discounts. Literally a bolt on part, no hassle. I could go though 3 of them in the $ of your 1 and have $ left over.Actually parts are around $85-$100 CDN range, genuine ones. Cheap ones aren't worth the hassle. Plus you have to wait for part. I didnt.
Advance auto, life time warranty, in stock, $62 usd after stacked discounts. Literally a bolt on part, no hassle. I could go though 3 of them in the $ of your 1 and have $ left over.