[rotorwrench]

On a new battery, it should be top charged for a few hours to ensure low load on the generator. The battery voltage should be a bit more than 6-volts. Normal would be around 6.2 volts at rest. If the vehicle has set up for long period then the generator field should be flashed to insure good pole shoe residual magnetism with proper polarity. All the old 6-volt vehicles have positive ground after the model T era. Be sure all related electrical connections are clean and secure.