Abstract: Electrical interconnections between two assemblies, whose connectors are located in hard-to-access areas of an apparatus, are easily connected or disconnected by mounting one of the connectors on a holder which is movable on a support. A first connector is electrically connected to components of a first assembly by flexible leads, and is mounted mechanically on a holder which is detachably aligned on a support fixed on that first assembly. In an initial position, the first assembly's connector is fixed in a position which allows easy access by a test device for electrical connection to the connector. To interconnect the two assemblies in the apparatus, the first assembly is mechanically mounted in its final position, with its connector arranged approximately in line with the mating connector of the second assembly. The holder, which has a long handle or grip providing easy access from the exterior of the apparatus, is then moved along the support toward the second connector.