What is the set up? If you are running non-stock + or - fog lights, thumping stereo and lots of juice sucking equipment then maybe. 

I have an 85 gl 7 passenger vanagon. My 90 amp alternator handles the fogs, stereo, wipers, h4 headlights and the normal stuff fine. 

Your vanagon in comparison  with rabbits and sciroccos of the same year already had the upgrade. As most of these had a 65 amp alt at best. 

Hth
Tony

Sent from my iPhone

On Sep 25, 2013, at 5:52 PM, Scott Greiner <greines@YAHOO.COM> wrote:

> Looking for suggestion for replacing my 90 amp stock Alternator in my 1982 Diesel Westy with a 1.9TDIe motor. Is the 120 amp alternator a better option for running my setup?
> 
> 
> 
> Scott Greiner
> Mesa AZ