Sbronder02

When I turn my rear window defroster on, the light on the switch turns on, the fuses are good and have power to them, but the defroster does not have power to it. The grid looks good on the window. When I first tested the grid it only had a little power to it, the signal was strong when I was on the left side of the grid and got weaker as I moved to the right side. Then a minute or two later it had no power. Does the defroster have a relay that could have gone bad? I have also tested the wire before it gets to the connectors on the grid, and I took the connectors off and put them back on. Still no luck.