Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 192Get this manual
HONDA BF2OA-25A
5INSPECTION
STARTER SOLENOID
NOTE Be sure the battery is in good condition before performing this testConnect the blacklwhite wire of the solenoid the positive+ terminal of the battery and black wire the negative- terminal and check for continuityThere should be continuity between the terminalsThere should be no continuity when the battery is disconnected
FUSEIFUSE CASE
Check the fuse for continuityConnect the fuse the fuse case and check the case for continuity