wire size is 14awg for landscape lights. 12v system run off a 300w multi tap transformer.the run from trans to end of cable with no lights hooked up at all is 58ft the voltage reading is 10.2volts. trans tap is at 15v. why so low a voltage and end off run without a light hooked up yet???? I need to hook up 3 50watt spot and 1 20 watt spot. these lights are on a 40ft run. any help would be great thanks.