Abstract: A vehicular remote electric power supply accessory unit for connection to the electrical system of a motor vehicle to supply electrical power for the operation of electrical hand tools or other electrical power requiring units. The electrical power generating alternator of the electrical system of the vehicle is utilized as a source of power, and switching means is provided for connecting the power output of the alternator selectively to a remote power outlet receptacle and to the customary battery and electrical system circuity of the vehicle. The power output from the alternator is disconnected from the battery circuit while the remote unit is in operation. Means is provided for preventing overloading the voltage regulator of the electrical system of the vehicle from the remote circuit connection and for indicating that the remote circuit is in operation. Means is also provided for accommodating heavy current loads through the switching means.