Wiring Harness Resources, Guides, and News

Practical knowledge for building better wiring harnesses. Whether you are wiring your first project car, specifying connectors for an EV conversion, or designing production harnesses for industrial equipment, these guides cover the fundamentals and the details that separate a reliable harness from one that causes problems down the road.

Topics include wire gauge selection and voltage drop calculations, connector comparisons across Deutsch, Molex, TE Connectivity, and other major families, harness design best practices from layout to documentation, and step-by-step walkthroughs for common build types. Every article is written by people who actually build wiring harnesses, not marketing teams.

Want to put what you learn into practice? Our free wiring harness configurator lets you design your harness, select connectors from a library of 500+ options, and generate a complete bill of materials and cut list right in your browser.