Abstract: An electrical junction system for automotive internal wiring has a wiring board provided with branching conductors formed by a multiplicity of bus bars on an insulation plate, the branching conductors being adapted to be connected to electric wires in a wiring harness to form branching electric circuits. The electrical junction system has a printed circuit board detachably mounted on the wiring board, the printed circuit board generally or inclusively carrying a plurality of circuits incorporating a multiplicity of function parts which are used semi-permanently such as relays and associated control elements.

Abstract: A waterproof electric connector for use in electric wiring on automobile or the like. The connector has a male connector housing 2 and a female connector housing 1 having a hollow cylindrical portion 3 adapted to receive the male connector housing. A seal ring 28 made of rubber is mounted in the hollow cylindrical portion with its outer peripheral surface held in contact with the inner peripheral surface of the hollow cylindrical portion, and is latched and secured by a retainer ring 19 received by the hollow cylindrical portion. The connector further has a first locking means 20, 21; 15, 18 for locking the retainer ring when the latter is mounted in the hollow cylindrical portion and a second locking means 17; 31 for locking the male connector housing to the female connector housing when the male connector housing is inserted into the hollow cylindrical portion.

Abstract: Improved insulation piercing wire connectors are proposed which are provided with a plurality of prongs on the edges of a wire barrel, said prongs having their top tapering up toward the front for better mechanical and electrical connection.