1999 Subaru Forester Owner's Manual - Page 173

D If the plug on your electric appliance is either too loose or too tight for the accessory socket or dual power socket, this can result in a poor contact or cause the plug to get stuck. Only use plugs that fit properly. D Use of an electric appliance in the accessory socket or dual power socket for a long period of time while the engine is not running can cause battery discharge. D Before driving your vehicle, make sure that the plug and the cord on your electrical appliance will not interfere with your shifting gears and operating the accelerator and brake pedals. If they do, do not use the electrical appliance while driving. HS6000BA HS6001BA Electrical power (12V DC) from the battery is on tap at the socket when the ignition switch is either in the "ACC" or "ON" position. You can use an in-car use electrical appliance by connecting it to the socket. 6-20