Just listen to it and turn the idle speed screw clockwise to increase the RPM. When the engine sounds like it does when it's running down the road in high gear, it's about right to check the voltage. Generators don't get anywhere close to full output at idle speed.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!