The question I have is that my generator is only putting out about 100v. I would like to know if this will cause damage to anything that is running off the generator. Correct me if I am wrong but don't most appliances run between 110 and 120. I was told that the output of the generator could vary by + or - 10 to 20 percent.

The 100 volts is a bit low. Electrical device operate on +/- 10% , so the lowest volts supplied should be no lower than 108 volts.

Incandescent lamps and electric heat will work fine on 100 volts. But any motors may overheat using 100 volts.

Volts is usually changed on the genset by the speed or RPM of the gen motor.

Best to find the manual for the generator to find out how to change the voltage.

Thanks for the help, I will try that.