This walkthrough explores how to build a complete wiring harness in SOLIDWORKS Electrical and route it accurately in SOLIDWORKS 3D. It demonstrates inserting connectors, grouping wires into a harness, and using connection labels to populate origins, destinations and wire data automatically. The process continues with generating reports and transferring the harness into 3D, where connection points are added, components positioned and routes created or refined using sketches. The video concludes by producing automated harness drawings with dimensions, BOMs, balloons and connector labels, all ready for inclusion in the electrical project.