Re: 99 25hp Johnson battery charging kit?
No, only the opposite would be true. That is you don't want to put 10 amps through a 5 amp rectifier.
As for your concern, remember that the stator output varies from zero amps (motor stopped), to full output at wide open throttle. If low output would damage anything, you wouldn't dare slow the motor down to idle. Not to worry, it's OK.