Abstract: Apparatus is provided for testing the continuity and possible short circuit of a plurality of electrical switches and an associated multi-lead connecting cable of a conventional joy stick controller used for video games and the like. The apparatus includes a module provided with a power supply and a connector for receiving the control cable. A plurality of indicator lamps are connected in circuits with the joy stick switches and are spatially arranged on the module to correspond to a position of the joy stick which results in activation of the associated switch. The lamps indicate the continuity or short circuit of the switches as well as the associated leads of the connecting cable. Additional indicating lamps are provided on the module to indicate the continuity of other control switches on the controller which are operated independently of the joy stick.