Re: 1985 Evinrude 25 (E25ELCOC) - question about charging
If it is electric start then it should charge the battery; read the voltage of the battery with engine off then start it and read it again at the battery; if no difference then you probably have a bad rectifier. The engine does not need the battery to run since it is generating its own power t run. Never run an electric start engine with the battery unhooked; this will almost guarantee a fried rectifier. Good luck