1972 Evinrude StarFlire 125 HP Outboards Service Manual, PN 4822, Page 97Get this manual
ALTERNATOR CIRCUIT TROUBLESHOOTING
UNDER CHARGED BATTERY
I 12 VOLT BATTERY AMMETER
IGNITION SWITCH
aCheck condition of batterySection 7bCheck all connectionsclean
See Specifications
AMMETER
They must be tight &
TO ACCESSORIES
12 VOLT BATTERY