I vag'ed it and came up with:

VAG-COM Version: Release 311.2-N

Control Module Part Number: 037 906 259 D

Component and/or Version: MOTRONIC M5.9 HS V09

Software Coding: 00000

Work Shop Code: WSC 00066

3 Faults Found:

17884 - EVAP Leak Detection Pump: Insufficient Vacuum

P1476 - 35-00 - -

00668 - Supply Voltage Terminal 30

07-10 - Signal to Low - Intermittent

17988 - Throttle Actuator (Bank 1): Malfunction

P1580 - 35-00 - -


Anyone have any ideas on what went wrong? It died graduaally and I'm thinking it might be the alternator but any input is appreciated!

 

http://www.ross-tech.com/vag-com/cars/vwmkIV.html

Have you tested the voltage at the battery? With the car running & off. WHAT IS IT?

My guess is there is a ground problem. The car died, due to the throttle body not functioning.

 

I measured the voltage at the battery. 11.6 volts with the car off, 10.5 volts with the engine running - there's an issue there!

 

The battery is weak, unloaded voltage should be over 12v, usually it's around 12.6. It should be around 14.4 with the car running.
So yes, I would say the alt is not working properly.