1971 Evinrude StarFlite 100 HP Outboards Service Manual, PN 4753, Page 95Get this manual
ALTERNATOR CIRCUIT TROUBLESHOOTING
UNDER CHARGED BATTERY
AMMETER
12 VOLT BATTERY
STEPaCheck condition of batterySee Specifications Section 7bCheck all connectionscleanThey must be tight &
AMMETER
TO ACCESSORIES
12 VOLT BATTERY
cCheck electrical load on systemIf total current draw from engine and accessories is greater than amps, 15 ampconversion kit is recommendeddInspect cables and leads for worn insulationALTERNATOR OUTPUT CHECK