1978 Johnson 175, 200, 235 HP Outboard Service Manual, Page 158Get this manual
CHARGING CIRCUIT CHECKS Where To Look Cause What To Do UNDERCHARGED BATTERY Result
BATTERY
1Defective battery or worn
2345out battery Low electrolyte level Corroded terminal connections Loose terminal connections Excessive electrical load
Check state of charge Add water Clean with wire brush and coat with petrolatum jelly Tighten securely Check total current draw in circuit Clean and tighten connections Check leads for defective lead insulation or connectorsCheck for worn through insulationDisconnect rectifier leads High reading on one check and low and check HI ohms reading on otherdiode OK scaleZero reading on both checks diode shortedHigh reading on both checks diode openRun motor at 43004600 rpm and note ammeter readingNOTE: Disconnect all accessoriesConnect ohmmeter leads to either yellow or yellowgray lead and groundConnect ohmmeter leads to yellow and yellow gray leadsIf ammeter shows no charge,