Another gas gauge problem

Okay so check the left kick panel connector and then gauges. Were not sure if the possible break in the line is at the gauge or between the connector and the tank though so we came up with an idea to see which wire runs to the tank (as we havent been able to figure out with the wire only getting juice when it wants which is the sending unit wire) and see if the short is in the section from the tank to kick panel and I'd like to know what you all think of this idea and if we may blow something else up if we do it. What if we unhooked the kick panel connector and unhook the wire from the sending unit and then put a current on that one wire? Thatshould tell us which wire in the connector is the sending unit wire and if none light up when tested that the break is in that section. Right?