Alternator question

[behrleiii at yahoo.com (Behrle Hubbuch)]

Recently I swapped out Dieter's stock 65 amp alternator for 90(?) amp alternator I had rebuilt for my Jetta ECOdiesel but didn't need.  I had to modify the mounting bolt bracket on the case so the pullys would line up and build a plug so I didn't have to alter the original wiring but I got it in.  It throws out plenty of juice according to the GTI volt meter which has replaced the clock.  The problem is when I first start the car the alternator doesn't start charging until I rev it up to around 4 grand!  After that it's fine.  What have I missed?  There is the W plug on the alternator which has no wire in the original harness, do I need to add one?  If so where does the other end go?  I would appreciate any advice.
 
Thanks,
 
Behrle

P.S. I did manage to get a few decent pewter Scirocco key fobs cast before the mold gave up.  The resin hosed the RTV mold. If any one is still interested I can send you one.


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