Abstract: A transparent base supports two or more socket boards side-by-side. Binding posts are arrayed on the longer side of one rectangular socket board. Turning the assembly over allows the user to see how the sockets are connected to the busbars on the backsides of the side-by-side socket boards.

Abstract: Instructional apparatus for training automotive service technicians in the skills required for isolating, identifying and repairing malfunctions in sophisticated automotive electronic systems uses a group of electronic circuit modules wherein each module simulates at least a portion of an automotive electronic circuit and one or more modules may be connected to form more complex circuits. One or more jumper wires associated with each of the modules may be altered by an instructor to create at least one fault condition representative of an electrical malfunction in the circuit associated with the module.