A wire harness for preventing water from contacting capped, connected electrical wires. A lid and a base define an interior chamber. The base has fingers extending vertically upwardly for holding wire caps and connected electrical wires therein. A shelf protrudes from the inner surface of each finger to provide a platform for the bottom edge of the wire cap to seat against, securing the wire cap against downward movement. The sidewalls of the lid extend a predetermined distance below the shelves of the fingers to form a rim that creates a double air trap within the harness for preventing water from contacting the conductive portions of the wires.