1999 "EE" 90, 115 FFI, 150, 175 V4, V6 FFI Outboards Service Repair Manual, P/N 787024, Page 145Get this manual
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Charging System Tests 50
2 Connect 0-40 amp ammeter in series between the main power relay red lead and the battery side of the starter solenoid
3 Reconnect the engine's battery cables