1988 Johnson Evinrude "CC" 9.9 thru 30 Service Manual, P/N 507660, Page 328Get this manual
Charging System Check ChartAll Models Where to Look Battery Cause 1Battery defective or worn out Procedure 1Check condition and charge Reference All Steps See Pages 8-4 thru 8-7
2Low electrolyte level 3Terminal connections loose
or corroded 4Excessive electrical load Wiring 1Connections loose or corroded 2Stator leads shorted or grounded 3Circuit wiring grounded 1Damaged stator windings 2Weak flywheel magnets
2Add water and recharge 3Clean and tighten