Connections To The Battery - Honda Outboard Motor BF9.9A/15A Owner's Manual

INSTALLATION
Connections to the Battery
Connect the positive (+) battery cable to the positive (+) battery terminal, then
connect the negative (-) battery cable to the negative (-) battery terminal.
The negative (-) battery cable should always be removed from the battery
when connecting or disconnecting the positive (+) battery cable, so tools
cannot cause a short circuit if they touch a grounded part while being used on
the positive (+) battery terminal fitting.
Be careful to avoid connecting the battery in reverse polarity, as that will
damage the battery-charging system in the outboard motor.
. BLACK
NEGATIVE (-)
TERMINAL