Abstract: A dump truck end gate locking system includes a dump truck having a chassis and a cargo box which pivots between a transport position and a dumping position. The cargo box has an end gate. A sensor is provided for sensing when the cargo box is in the transport position. A locking member is provided having a locked position engaging the end gate and an unlocked position disengaged from the end gate. A drive mechanism for the locking member is coupled to the sensor. The drive mechanism moves the locking member to the locked position to secure the end gate when the sensor indicates the cargo box is in the transport position. The drive mechanism moves the locking member to the unlocked position to release the end gate when the sensor indicates the cargo box has moved from the transport position to assume a dumping position.