Depending on where the alternator was purchased and if it was a rebuilt 2 years is all you might get out of it. Not sure what engine you have but if it is the 6 cyl. removing the alternator is a simple job and requires you to remove the main accessory drive belt. If this was me doing it and I am not all that sure of the maintenance previously done I would order a new belt, tensioner, and idler pully. I would pull the alternator and battery and bring them to either advance auto or whatever local auto parts place has the means to check them. Normally I do not purchase these items from them but in a pinch I have purchased the alternator from advance auto and with their lifetime guarantee have had to exchange it several times as it went bad 2 or 3 times on my E46. My best guess is your alternator is DOA and your car is running off of battery power until it loses its power.
I purchase most of my items from FCP Euro as they have the best warranty in the business. If time is not an issue I suggest this is what you should do as well. If time is an issue purchase the alternator locally and if the belt, tensioner and and idler pully are ok just order them from a reputable place with OE parts and not crap from the local guy. Unless of course he has OE parts.
There are plenty of DIY instructions on doing this job and as I said pulling the 3.0 engine alternator is a simple job and one that will familiarize you to maintaining your car properly.
Best of luck.
T
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