Honda BF15D BF20D Outboard Motors Shop Manual., Page 284Get this manual
bINSPECTION NEUTRAL SWITCH (Type with electric starter) Check for continuity between the terminalsThere should be continuity with the switch pushed (gearshift in NEUTRAL)There should be no continuity with the switch released (gearshift in FORWARD or REVERSE)
INDICATOR (Tiller handle type)
The indicator should turn on when connecting 12V battery (+) terminal to the Orange terminal and (-) to the Black terminalBe sure the battery is in good condition before performing the test
cINSTALLATION