2004 SR Johnson 2-stroke 40, 50HP Service Manual, Page 83Get this manual
ELECTRICAL CHARGING SYSTEM TESTS
CHARGING SYSTEM TESTS
Charging System Check Chart
Where to Look Cause
Battery defective or worn out Low electrolyte level Battery Terminal connections loose or corroded Excessive electrical load Connections loose or corroded Wiring Stator leads shorted or grounded Circuit wiring grounded Damaged stator windings Alternator stator Weak flywheel magnets Damaged stator leads Rectifier Damaged wiring or diodes Rectifierregulator Inoperative rectifierregulator Clean and tighten Evaluate accessory loads Clean and tighten Perform ohmmeter tests Perform ohmmeter tests Perform ohmmeter tests Perform running output tests Perform ohmmeter tests Perform rectifier ohmmeter tests Perform variable load tests Wiring Diagram Stator resistance or rectifier ohmmeter tests Stator resistance test Running alternator output test Stator resistance test Rectifier ohmmeter tests Rectifierregulator tests
Procedure
Check condition and charge Add water and recharge
Reference
Battery manufacturer's information and Installation and Predelivery section