this description of the preferred embodiment is intended to be read in connection with the accompanying drawings , which are to be considered part of the entire written description of this invention . in the description , relative terms such as “ lower ”, “ upper ”, “ horizontal ”, “ vertical ”, “ above ”, “ below ”, “ up ”, “ down ”, “ top ” and “ bottom ”, as well as derivative thereof ( e . g ., “ horizontally ”, “ downwardly ”, “ upwardly ”, etc .) should be construed to refer to the orientation as then described or as shown in the drawings under discussion . these relative terms are for convenience of description and do not require that the apparatus be constructed or operated in a particular orientation . terms such as “ connected ”, “ connecting ”, “ attached ”, “ attaching ”, “ joined ”, and “ joining ” are used interchangeably and refer to one structure or surface being secured to another structure or surface or integrally fabricated in one piece unless expressly described otherwise . fig1 and 2 illustrate gondola - type shelving units 10 . the gondola - type shelving unit 10 has a base 12 , a lower back section 14 , and an upper back section 16 . the gondola - type shelving unit 10 also includes three vertical support members 18 , 20 and 22 extending upwardly from the base 12 . the lower back section 14 includes a pair of panels 24 and 26 while the upper back section 16 includes panels 28 and 30 . as shown in fig2 , a plurality of shelves 32 are attached to and extend outwardly from the vertical support rails 18 - 22 . fig3 shows a lighting assembly 40 particularly well suited for use with gondola - type shelving of the type shown in fig1 and 2 . the lighting assembly 40 includes a track 42 which is coupled to a power supply 44 which , in turn , is coupled to an electrical outlet 46 . as such , the track 42 is energized by the power supply 44 and electrical outlet 46 . also shown in fig3 is a plurality of light sources 48 . each light source 48 is intended to be coupled to the bottom of one of the shelves 32 near the front edge of the shelf . fig3 also shows wiring harnesses 50 coupling the light fixtures 48 to the track 42 . fig3 also shows an end cap 52 covering the top end of the track and a wiring harness 54 which couples the track to the power supply . the present invention provides improvements to the electrical assemblies in the form of wiring harnesses such as 50 and 54 shown in fig3 . one such improved electrical assembly is shown in fig4 - 6 . visible in fig4 is a vertical support rail 20 which includes a plurality of slots 21 used to couple the shelves 32 to the vertical support rail . also shown in fig4 are the upper and lower back panels 30 and 26 as well as a coupling member 27 used to join the edges of the back panels 26 and 30 together . attached adjacent to the top back panel 30 and the vertical support 20 is a first track portion or section 41 of track 42 . attached adjacent back panel 26 and , vertical support 20 is a second track portion or section 43 of track 42 . during assembly , the upper track portion 41 is secured to panel 30 and the lower track portion 43 is secured to panel 26 . however , this leaves a physical gap between the track portions 41 and 43 and no electrical connection between the conductors residing within these track portions . to close the gap and provide such an electrical connection , wiring harness 50 is provided . the wiring harness 50 includes a positive insulated conductor 52 and a negative insulated conductor 54 which together comprise a 2 - wire cable 56 . attached to opposite ends of cable 56 are connectors 58 . these connectors are designed to mate with the open ends of the track sections 41 and 43 such that the wiring harness provides an electrical connection between the negative conductors within track portions 41 and 43 and , an electrical connection between the positive conductors located within the track portions 41 and 43 . more specifically , and as better illustrated in fig6 , the track portions 41 and 43 include a pair of electrical conductors 60 and 61 located on opposite sides of a channel 62 . the channel 62 , as well as the two electrical conductors 60 and 61 , runs the length of the track sections 41 and 43 . the connectors 58 mate with the open ends of the track portions 41 and 43 as illustrated in fig4 and 5 . fig7 - 17 provide greater details concerning the construction of the assembly 50 and the features of the connectors 58 which provide quick connect and quick disconnect functionality while at the same time ensuring that cross - wiring does not occur . as best shown in fig1 , 15 and 17 , the connectors 58 comprise a molded plastic housing 70 and a cover 72 . the connector housing comprises a base 74 . extending upwardly from the base is a proximal wall 76 , a pair of sidewalls 78 and 80 and a distal wall 82 . extending forward from the distal wall 82 is a tongue 84 . a chamber 86 is formed by the base 74 and the proximal , side and distal walls 76 - 82 of the connector housing 70 . the proximal wall 76 includes an opening 77 through which the cable 56 may pass . the sidewalls 78 and 80 include lock openings 79 and 81 . the distal wall includes an opening 83 . the tongue 84 is external to the distal wall 82 in a direction opposed to the chamber 86 . the tongue 84 includes an alignment rail 86 and non - conductive pins 90 and 92 projecting upwardly from the tongue 84 . as noted above , the cable 56 includes a positive conductor 52 and a negative conductor 54 . the opposed ends of positive conductor 52 are connected , such as by soldering , to flat conductor tabs 100 and the opposed ends of conductor 54 are connected , such as by soldering or the like , to flat conductor tabs 102 . each flat conductor tab has a hole 104 extending through the tab . strain reliefs 106 cover and support the connection between the conductors 52 and 54 and the conductor tabs 100 and 102 . as part of the assembly process , the ends of the cable 56 are inserted into the housings 70 of the connectors so that the cable passes through the opening 77 in the proximal wall 77 of the base 74 , the strain reliefs 106 at one end of the cable reside within the chamber 86 of the housing and the flat conductor tabs 100 and 102 extend through the opening 83 in the distal wall and the holes 104 in the connector tabs 100 and 102 mate with respective pins 90 an 92 on the tongue 84 . further , the outside edge 108 of tab 100 and the outside edge 110 of tab 102 extend outwardly in opposite directions beyond the side edges of the tongue 84 when so assembled . when the flat conductor tabs 100 and 102 are over the pins 90 and 92 such that the pins 90 and 92 extend through the holes 104 , the alignment rail 88 extends between the inside edges of the tabs 100 and 102 to prevent them from coming in contact with each other and a short circuit being formed . the cover 72 of the connector housing 70 includes a chamber cover portion 120 and a tongue cover portion 122 . projecting from the sides of the chamber cover portion 120 are locking tabs 124 which mate with the lock openings 79 and 81 of the connector housing 70 . further , the tongue cover member 122 includes an alignment channel . 126 which mates with the alignment rail 88 such that the alignment rail 88 , alignment channel 126 , lock openings 79 and 81 and locking tabs 124 secure the cover 72 to the housing 70 to complete the assembly . when so assembled , the strain reliefs 106 are locked within the chamber 86 and the conductor tabs 100 and 102 are locked in place by the pins 90 and 92 between the tongue 84 and the tongue cover member 122 . extending outwardly from one side of the tongue cover member 126 ( or alternatively tongue 84 ) is an alignment guide 128 . this alignment guide ensures that the connector 58 is not inserted into the end of the track 42 upside down which could lead to a short circuit or cross - wiring . the ends of the track sections are made asymmetrical and cooperate with the alignment guide 128 to provide this advantage . as illustrated in fig4 - 6 and 16 - 17 , two connectors 58 are attached at opposite ends of the cable 56 to complete the construction of the wiring harness . one of the connectors is attached to rail portion 41 and the other is attached to rail portion 43 . when so connected , independent electrical connections are made between the positive conductors 60 of the rail portions 41 and 43 via the positive conductor 52 and the positive conductor tabs 100 of the harness 50 . likewise , an electrical connection is made between the negative conductors 61 of the track portions 41 and 43 via the negative conductor 54 and the negative conductor tabs 102 of the harness 50 . the alignment guides 128 of the connectors 58 prevent the connectors 58 from being inserted into either track portion 41 or track portion 43 upside down which would , of course , lead to cross - wiring in a short circuit . in many cases , friction between the elements associated with the tongue portions of the connectors 58 and the channels 62 of the track portions 41 and 43 will prevent inadvertent disconnection or dislodgement of the wiring harness 50 from the track portions . to provide an additional measure of security , each track portion includes a hole 130 extending through the back of the track near the end of the track portion . likewise , each connector includes an arch - shaped tab 132 extending outwardly from the tongue cover member 122 which engages the hole 130 when the connector is joined to the end of the rail portion to provide further engagement . it should be clear from the foregoing the electrical assembly 50 provides a quick , easy and error - free method of creating a proper electrical connection between the track portions 41 and 43 . further , when the shelving assembly 10 is disassembled such that the panel 30 is removed , the electrical assembly comprising harness 50 will disconnect from one or both of the track sections 41 or 43 automatically and without damage to the track or the harness . there is no need for a person disassembling the shelf to disconnect the harness before taking the back of the shelving unit apart . connectors such as 58 may be used with other electrical assemblies to attach other items to the track . 42 . as shown in fig3 , one item typically coupled to the track is a power supply 44 . power supplies often include a pin - type connector designed to be coupled to a barrel jack . as shown in fig1 and 19 , a harness can easily be formed with such a barrel jack 140 at one end and connector 58 of the present invention at the opposite end , enabling the power supply 44 to be quickly and easily coupled to the track in an error - free manner . other power supplies incorporate other types of connectors . fig2 and 21 show a harness incorporating the connector 58 to the present invention at one end and an alternative power supply connector 142 at the opposite end . sometimes it is desirable to attach a pair of electrical devices to a track or , alternatively , supply power from a single power supply to a plurality of tracks . fig2 and 23 illustrate harnesses which incorporate the track connector 58 of the present invention with a pair of cables , one cable 56 attached at its opposite ends and to a female molex connector and the other cable 57 attached at its opposite end to a male molex connector . fig1 - 23 are provided to demonstrate that the connector 58 of the present invention has multiple applications when forming harnesses and the opposite end of the cable can be joined to the identical connector or to any of a variety of alternative connectors , those shown in fig1 - 23 merely illustrating some of the multitude of options which are available . from the foregoing , it will be appreciated that although specific examples have been described herein for purposes of illustration , various modifications may he made without deviating from the spirit and scope of this disclosure . by way of example , wiring harnesses may be formed using the connector of the present invention which includes one , two or even more cables with any of a number of different connectors attached to the opposite ends of the cables . likewise , the harnesses may be colored to match the shelving with which they are used to hide them from view . alternatively , the harnesses , connectors or cables may be color coded to meet the needs of a specific application . likewise , various indicia may be provided on the connector of the present invention . such indicia may be in the form of written labeling or ridges or the like formed in the connector housing 70 or connector cover 72 . likewise , the materials used to form various components may vary depending on the particular application . for example , the gauge of the wire used in the cabling may be altered and the material used as conductive elements in the cable may be altered depending on the cost of raw materials . examples of such conductive materials include aluminum or copper . the cable , of course , will be provided with a non - conductive sheath to prevent a short circuit from being created between the conductive elements and the shelving components which are typically made of metal . likewise , the housing and cover of the connectors 58 can be made out of any of a variety of non - conductive plastics or other non - conductive materials . it is , therefore , intended that the foregoing detailed description be regarded as illustrative rather than limiting , and that it be understood that it is the following claims , including all equivalents , that are intended to identify the invention .