Honda BF50 (5HP) BF5A Outboard Motors Shop Manual., Page 37Get this manual
O INDICATOR LAMP Connect the BIackIRed wire the dry cell positive terminal and lackYe[low wire the negative terminalThe indicator lamp should come on
FUSEIFUSE HOLDER (Optional part)
Check the fuse for continuityInstall the fuse in the holder and check the continuity
D.CRECEPTACLE (Optional part)
After checking the fuse holder be sure there is continuity through the fuse, short circuit the rectifier connector, and check be sure there continuity between the receptacle terminals