1971 Johnson 60HP outboards Service Manual, Page 81Get this manual
ALTERNATOR CIRCUIT TROUBLESHOOTING STEP1
UNDER CHARGED BATTERY12 VOLT BATTERY AMMETER
STEPaCheck condition of batterySection 7bCheck all connectionscleanSee Specifications
-G)-r-TO ACCESSORIES12 VOLT BATTERY :
AMMETER
They must be tight &
cCheck electrical load on systemIf total current draw from engine and accessories is greater than amps15 ampconversion kit is recommendeddInspect cables and leads for worn insulationALTERNATOR OUTPUT CHECK