2010 Mercedes ML-Class Owner's Manual - Page 199

Useful features minimum level, the power outlets are automatically switched off, to help preserve engine starting power. 197 12V Power outlets ! If you use all power outlets in the vehicle, make sure that the maximum current drawn does not exceed 55 A. ! The power outlets in the front passenger footwell and cargo compartment are not designed for use with the electric air pump. Use the power outlet in the second-row footwell for electric air pump operation. The power outlets can be used to accommodate 12V DC electrical accessories (e.g. mobile phone chargers, auxiliary lamps) up to a maximum of 20 A (240 W). X X Switch on the ignition. Push in cigarette lighter :. Cigarette lighter : will pop out automatically when hot. X Take out cigarette lighter :. X Reinsert cigarette lighter : in its socket after use. ! The lighter socket can be used to accommodate 12V DC electrical accessories (up to a maximum of 180 W) designed for use with the standard "cigarette lighter" plug type. Keep in mind, however, that connecting accessories to the lighter socket (for example extensive connecting and disconnecting, or using plugs that do not fit properly) can damage the lighter socket. With the socket damaged, the lighter may not function properly any longer. ! The cigarette lighter is not designed for use with the electric air pump. Use the power outlet in the second-row footwell for electric air pump operation. Power outlets i You can use the power outlets even if the ignition is switched off. An emergency shut-off feature is designed to prevent the vehicle's on-board voltage from dropping below a minimum level. If the on-board voltage drops to this Front passenger footwell Second-row footwell Z Controls in detail