Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 199Get this manual
HONDA BFSOAe8SA
WARNING BUZZER (Remote control type only)
Be sure the battery is in good condition before performing this test
Connect the blacklyellow terminal of the warning buzzer the positive+ terminal of the 12 battery and the yellowlgreen terminal to the negative-terminal of the batteryThe warning buzzer should sound
EMERGENCY STOP SWITCH
Attach the tester leads the terminals of the emergency stop switch and check for continuity