Honda Outboards BF40A/BF50A Service Manual, Page 384Get this manual
BF40A-BFSOA
4INDICATOR
aINSPECTION
The green indicator should turn on when connecting 12V battery (+) terminal to the Blacklyellow terminal and (-) to the Orange terminalThe red indicator should turn on when connecting 12V battery (+) terminal to the Blackyellow terminal and to the Red terminal Be sure the battery is in good condition before performing the test '