1968 Evinrude Big Twin, Big Twin Electric, Lark 40 HP Outboards Service Manual, Page 87Get this manual
CHARGING CIRCUIT CHECKS Reading Approximately 12.5 volts Slightly below 12.5 volts Indication Fully charged batteryPartially discharged battery or bad connections in battery circuitOpen battery circuitCheck or CorrectionProceed with testsCheck wiring and connectionsFuHy charged battery installed to reduce checking time
No reading
reading
Open battery circuit
Check wiring and connections from battery to starter solenoid, at ammeter terminals and back to motorCheck ground connections at battery and in lower front motor coverboat,