Nicholas Bauer, of Slicknessindustries, can handle all of your wiring harness needs from mild to wild.
Here is a Renault Twizy EV harness, Nick extended, and modified to fit into a vehicle twice the original wheelbase and track width called the Local Motors, Strati.
The harness came from a vehicle with a chassis ground and transplanted into a composite vehicle. This harness had to function properly, the first time, at IMTS 2014 for demonstration, it was developed in 40 days under impossible deadlines and limited resources.
It functioned properly and the vehicle wound up driving around the streets of Chicago, turn signals, brake lights and all; this was the first test of the vehicle.
Nicholas also led a small team to assemble, fabricate and test the STRATI vehicle at Oak Ridge National Laboratory and on the floor in Chicago with the help of Brandon Klingaman and Kyle Heart.