2003 Dodge Durango rear defrost and wiper

Gayle the weak spot in any wiring harness is where the wires flex, this is at the top comming out of the body, and going into the rear liftgate, check there for broken wires, it's a common problem. Turn the defroster on and use a test light or voltmeter on the connector on the glass, if it does not light, power isnt getting to it, and this would indicate a fuse blown, or a wire broken or grounded.