generator output

[Neshkoro]

I'm having some issue with the charging system on my A. The generator is stock. The cutout kicks in when the car is started. The ammeter reads zero. I've tried another ammeter and it reads the same. i measured the amp output and the voltage output at the generator with my digital multimeter. Both the amp and volt readings are unstable. The numbers bounce around so much I can't get a steady reading. I was thinking of just replacing the generator with a 6 volt positive ground alternator.
Ant thoughts on the generator?