I have a 2006 Outback with a rear defroster that is not working. I have power to the passenger side terminal and the ground has continuity. When I follow the trouble shooting steps from the repair manual using the multi-meter I get voltage readings that are constantly fluctuating no matter where I place the positive probe (with tin foil) on the heating element. The volts will go as high as 300+volts. Am I doing something incorrectly? It almost seems like the trim piece rubbed away the heating element where it would connect to the "strip" of conductive material that runs from the positive terminal to the heating element but I can not tell for certain. Any suggestions would be appreciated.