NOCO Genius GENPRO Serie Mode D'emploi page 6

gauge metal part of the frame or engine block.
6.) For positive-grounded vehicle only, connect NEGATIVE (BLACK) battery clamp or eyelet terminal connector from battery charger to NEGATIVE (NEG, N, -)
ungrounded battery terminal. Connect POSITIVE (RED) battery clamp or eyelet terminal connector to vehicle chassis or engine block away from battery. Connect to a
heavy gauge metal part of the frame or engine block.
7.) Connect the battery charger into a suitable electrical outlet. Do not face the battery when making this connection.
8.) When disconnecting the battery charger, disconnect in the reverse sequence, removing the negative first (or positive first for positive ground systems).
FOLLOW THESE STEPS WHEN BATTERY IS OUTSIDE VEHICLE. WARNING: A SPARK NEAR THE BATTERY MAY CAUSE A BATTERY EXPLOSION. TO REDUCE
THE RISK OF A SPARK NEAR THE BATTERY:
1.) Check polarity of battery terminals. The POSITIVE (POS, P, +) battery terminal usually has a larger diameter than the NEGATIVE (NEG, N, -) battery terminal.
2.) Attach at least a 24-inch-long 6-gauge (AWG) insulated battery cable to NEGATIVE (NEG, N, -) battery terminal.
3.) Connect POSITIVE (RED) battery clamp or eyelet terminal connector from battery charger to POSITIVE (POS, P. +) battery terminal.
4.) Position yourself and free end of cable as far away from battery as possible - then connect NEGATIVE (BLACK) battery clamp or eyelet terminal connector to free
end of cable.
5.) Connect the battery charger into a suitable electrical outlet. Do not face the battery when making this connection.
6.) When disconnecting charger, always do so in reverse sequence of connecting procedure and break first connection while as far away from battery as practical.
7.) A marine (boat) battery must be removed and charged on shore. To charge it on board requires equipment specially designed for marine use.