<VV> Do Gen Pulleys Lose Their Grip?

[goofyroo@excite.com]

 I have a modern (7127) alternator installed on an early with a custom bracket.  It uses the original generator pulley.  The system works fine until you put a really, really heavy load on the alternator (AC with condenser fan), then the voltage starts dropping.
 
An alternator rebuilder, whom I know and trust, says the unit checks out fine.  (I had replaced the diodes, regulator, and brushes in troubleshooting.)  He says the belt is probably losing grip.
 
When you look at it, on a Corvair the belt only grips the gen/alt and idler pulley over about 1/4 of the pulleys' circumference.  Unlike on other engines, where the belt contacts about 2/3 of the pulley.
 
Any thoughts on what might be done to improve the grip?  I have tried tightening the belt, using a "cogged" belt, and loosening the belt, to no avail.
 
Michael SmithDallas

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