wiringharness.coBody Harness — Design and Build Guide
What is it?
A body harness covers every electrical circuit mounted to the vehicle body rather than the engine or frame. This includes power window motors, door lock actuators, mirror adjusters, seat heaters, dome lights, courtesy lights, and any infotainment or speaker wiring. In modern builds, body harnesses often carry CAN bus or LIN bus signals to communicate with body control modules.
What's included
A body harness typically includes door sub-harnesses with boot grommets for the door jamb flex point, pillar-routed speaker and antenna leads, headliner wiring for dome lights and sunroof motors, and trunk or liftgate sub-harnesses. It also includes connectors for seat heaters, lumbar adjusters, and any OBD-II diagnostic port wiring routed through the dash area.
Common applications
- Restomod builds adding power windows, locks, and seats to classic cars
- Custom interior builds with aftermarket infotainment and amplifier wiring
- Fleet vehicle upfits requiring additional interior lighting and switch panels
- Conversion vans and camper builds with 12V interior lighting circuits
- Show cars with custom LED interior accent lighting and motorized panels