1988 Johnson 20 hp Charging System

[pudsy01]

Can you advise what parts I need to add a charging system to this motor? I want to charge a battery to run accessories.

Thank you

 

[pudsy01]

I also have a small hole 1/8" dia forward on the left side of the water intake in the lower end, what is this hole for?

 

[whaler__pr]

what accesories are you planning to use?