NOCO Genius G750 Manuel D'utilisation page 4

a negative ground system (most common). If your
vehicle is a positive ground system (very uncommon), follow
the below instructions in reverse order.
1.) Connect the positive (red) battery clamp or eyelet
terminal connector to the positive (POS,P,+) battery
terminal.
2.) Connect the negative (black) battery clamp or eyelet
terminal connector to the negative (NEG,N,-) battery
terminal or vehicle chassis.
3.) Connect the battery charger's AC power plug into a
suitable electrical outlet. Do not face the battery when
making this connection.
4.) When disconnecting the battery charger, disconnect
in the reverse sequence, removing the negative first
(or positive first for positive ground systems).
Begin Charging.
1.) Verify the voltage and chemistry of the battery.
2.) Confirm that you have connected the battery clamps or
eyelet terminal connectors properly and the AC power plug
is plugged into an electrical outlet.
3.) The charger will begin in Standby mode, indicated by
an orange LED. In Standby, the charger is not providing
any power.
4.) Press the mode button to toggle to the appropriate
charge mode (press and hold for three seconds to enter an
advanced charge mode) for the voltage and chemistry of
your battery.
5.) The mode LED will illuminate the selected charge mode
and the Charge LEDs will illuminate (depending on the
health of the battery) indicating the charging process has
started.
6.) The charger can now be left connected to the battery at
all times to provide maintenance charging.