An apparatus for electrically connecting and attaching an electrical device to a wall in a vehicle, comprising: a universal base plate with a first connection region with a first electrical connector arranged therein a universal rear wall with a second connection region with a second electrical connector positioned therein at least one first guide element (127, 128) on the rear wall and a corresponding second guide element (125, 126) on the base plate, wherein the universal base plate comprises attachment means for attachment to a wall in a vehicle, wherein the base plate in the first connection region comprises a first recess in which the first electrical connector is arranged, wherein the rear wall in the second connection region comprises a second recess in which the second electrical connector is arranged. wherein the first recess and the second recess are in each case arranged in a first flange or a second flange that extends at an angle from the base plate or the rear wall, wherein the universal rear wall is designed to form part of an electrical device or to be attached thereto, wherein the rear wall and the base plate are designed to be brought into mechanical engagement with each other, wherein during mechanical engagement the first and the second connection regions (131, 132) are arranged adjacent to each other in such a manner that the first electrical connector and the second electrical connector establish a mutual electrical connection, wherein the guide elements (125, 126, 127, 128) are designed to provide guidance to a movement parallel to the rear wall on the base plate after the rear wall and the base plate have been correspondingly positioned relative to each other in order to prevent the occurrence of any offset between the first electrical connector and the second electrical connector, and wherein the at least one first guide element (127, 128) is a delimitation edge (127, 128) of an opening in the rear wall adjacent to the second connection region, for feeding-through connecting cables, and wherein the at least one second guide element (125, 126) is an outer edge (125, 126) of a guide body connected to the base plate. a universal base plate with a first connection region with a first electrical connector arranged therein a universal rear wall with a second connection region with a second electrical connector positioned therein at least one first guide element (127, 128) on the rear wall and a corresponding second guide element (125, 126) on the base plate, wherein the universal base plate comprises attachment means for attachment to a wall in a vehicle, wherein the base plate in the first connection region comprises a first recess in which the first electrical connector is arranged, wherein the rear wall in the second connection region comprises a second recess in which the second electrical connector is arranged. wherein the first recess and the second recess are in each case arranged in a first flange or a second flange that extends at an angle from the base plate or the rear wall, wherein the universal rear wall is designed to form part of an electrical device or to be attached thereto, wherein the rear wall and the base plate are designed to be brought into mechanical engagement with each other, wherein during mechanical engagement the first and the second connection regions (131, 132) are arranged adjacent to each other in such a manner that the first electrical connector and the second electrical connector establish a mutual electrical connection, wherein the guide elements (125, 126, 127, 128) are designed to provide guidance to a movement parallel to the rear wall on the base plate after the rear wall and the base plate have been correspondingly positioned relative to each other in order to prevent the occurrence of any offset between the first electrical connector and the second electrical connector, and wherein the at least one first guide element (127, 128) is a delimitation edge (127, 128) of an opening in the rear wall adjacent to the second connection region, for feeding-through connecting cables, and wherein the at least one second guide element (125, 126) is an outer edge (125, 126) of a guide body connected to the base plate.