Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 198Get this manual
STARTER BUTTON (Tiller handle type only) Connect the starter button 2P connector, attach the tester leads to the 2P connector terminal joints, and push the starter buttonThe switch is normal if there is continuity when the button is pushed
IGNITION SWITCH (Remote control type)
Check for continuity between the terminals with the switch in each position
00 Continuity INDICATOR LIGHTS
Remote control type: NOTE Be sure the battery is in good condition before performing] this testApply 12V the Gr terminal and connect the switches 1,2, and to the Bl, R, and terminals respectivelyWhen SW is On: The green lamp should turn onWhen SW1 and SW3 are ON: The green lamp should go offWhen SW2 is ON: The red lamp should turn onTiller handle type: Check the oil pressure switch and CDI unitIf they are normal but the indicator light does not turn ON when the engine is running, replace the indicator light