Re: does a johnson 1980 35 hp have an alternator ?
I believe its called a stator and if it was original elec. start it has charging capabilities if not and it was manual start there is no charging. a Fish finder (sonar) draws so little it should run easily off one batt.
Even if the motor can charge the batt, it takes lots of running to charge a batt.
I have a 35 manual start that I converted to elec start,I didnt bother installing a charger,I fish alot can run the sonar,seperate GPS for days and it doesnt lower the batt charge so the motor wont start.I charge it once a week. I fish every day summer time some times morning and evening.