Before connecting your charger, ensure you are in a to prevent the buildup of explosive gases.
Charge voltage is too high (often indicates a 24V battery is connected instead of 12V).
For a battery still in a vehicle, attach the Black clamp to a heavy, unpainted metal part of the engine block or chassis—away from the battery and moving parts. If the battery is out of the vehicle, attach a 24-inch 6-gauge insulated cable to the negative post first, then connect the black clamp to that cable.
