How We Built a Complete Vehicle Wiring System in 10 Weeks!
Prototype wiring harness design can become difficult very quickly, especially when the vehicle build is moving fast and the electrical system is still developing.
Recently, EDS Master supported a U.S.-based customer with a complete prototype electrical system package. The work included electrical design support, wiring schematics, 2D harness drawings, manufacturing coordination, harness assembly, testing, packing, and delivery.
The full project was completed in less than 10 weeks, from the first electrical schematic to the final prototype harnesses delivered to the customer.
I would not say this was easy. It needed good planning, quick decisions, and close communication between the customer, our design team, and our manufacturing partners in Romania. But it was a good example of how a focused engineering team can support a complex prototype project without making the process heavier than it needs to be.
Project overview
The customer was building a new vehicle prototype and needed support with the low-voltage electrical system.
Our scope covered the design and manufacturing support needed to move from electrical concept to physical harnesses ready for installation.
Some project figures:
- Over 2,080 metres of wire
- More than 470 connectors
- 2D harness drawings prepared by EDS Master engineers
- Prototype harness assembly completed through our trusted manufacturing partners in Romania
- Harnesses tested, packed, and shipped to the customer’s site in the U.S.
- Full delivery completed in under 10 weeks
For a prototype build, this kind of timing is not only about working fast. It is also about avoiding confusion, keeping the documentation under control, and making sure that design decisions can be manufactured.
Starting from the electrical schematic
The first step was to work through the electrical schematic and understand what the customer needed from the system.
At this stage, the important points were not only the circuits themselves, but also the practical details behind them:
- Connector selection
- Wire sizes and cable types
- Grounding and power distribution
- Routing assumptions
- Serviceability
- Manufacturing constraints
- Installation requirements on the vehicle
This is where experience helps. A schematic can look correct electrically, but it still needs to become a harness that can be routed, built, tested, and fitted on the vehicle.
Our focus was to keep the design practical from the beginning.
Turning the design into harness drawings
After the schematic and design direction were agreed, we prepared the 2D harness drawings.
For us, a harness drawing is not just a document to show wire lengths and connector views. It is one of the main communication tools between engineering, manufacturing, quality, and vehicle build teams.
The harness drawings included the information needed for prototype manufacturing and installation, such as:
- Connector details
- Wire information
- Branching and breakout points
- Bundle lengths
- Protection and covering requirements
- Labels and identification
- Build notes
- Manufacturing and checking information
Good harness drawings reduce questions during the build. They also make it easier to identify issues early, before the harness reaches the vehicle.
Manufacturing support through Romanian partners
EDS Master handled the design work and coordinated the manufacturing support with our trusted partners in Romania.
This setup works well for prototype projects because it keeps the engineering and manufacturing communication close. If a drawing detail needs clarification, or if a component creates a practical issue during the build, it can be discussed quickly.
For this project, the harnesses were assembled, checked, packed, and shipped directly to the customer.
The aim was simple: deliver harnesses that were ready to be installed, without creating unnecessary work for the customer’s build team.
Why this type of project needs close communication
On prototype projects, changes are normal. Sometimes packaging changes, components move, connectors are updated, or routing needs to be adjusted.
Because of this, the process needs to be flexible, but still controlled.
For this project, we kept close contact with the customer’s engineering team during the design and manufacturing stages. This helped us keep the work moving and avoid delays caused by unclear inputs or assumptions.
In our experience, this is one of the most important parts of prototype wiring harness design. The technical work matters, of course, but communication can make the difference between a smooth project and a stressful one.
What EDS Master supported
For this project, EDS Master supported the customer with:
- Electrical design support
- Wiring schematic development
- Wiring harness design
- 2D harness drawings
- Manufacturing documentation
- Prototype harness manufacturing coordination
- Harness testing and delivery support
This is the type of work we enjoy doing because it connects design engineering with real manufacturing output.
We do not design only for the drawing. We design with the build in mind.
Design work that considers manufacturing
One point we always try to keep in mind is manufacturability.
A wiring harness can be designed in many ways, but not all design choices are equally good for manufacturing, installation, service, or later updates.
During the design process, we try to consider questions like:
- Can this harness be built consistently?
- Are the connector and wire details clear?
- Is the drawing easy enough for the manufacturing team to follow?
- Are the branches and lengths realistic for the vehicle?
- Are the coverings and protections suitable for the environment?
- Will the customer’s build team understand how to install it?
These are simple questions, but they prevent many problems later.
Supporting customers across design and build
EDS Master supports engineering teams with electrical design and wiring harness design services for automotive, off-highway, commercial vehicle, motorsport, robotics, and specialist vehicle projects.
Depending on the project, our support can include:
- System schematics
- Electrical distribution system design
- 3D routing support
- 2D harness drawings
- BOM preparation
- Manufacturing documentation
- Prototype harness manufacturing support
- Build and launch support
We can support only the design work, or we can help coordinate prototype harness manufacturing through our partners.
For many customers, this is useful because they do not need to manage design and manufacturing as completely separate activities.
A practical result
This project was a good example of what can be achieved when the customer, design team, and manufacturing team work in the same direction.
The result was not just a set of drawings. The result was a complete set of prototype harnesses, built and delivered for installation on the customer’s vehicle.
For us, this is the part that matters most.
Engineering documentation is important, but the final purpose is to help the customer move the project forward.
Need support with a prototype wiring harness project?
If you are working on a prototype vehicle, off-highway machine, motorsport application, robotics platform, or another low-voltage electrical system, EDS Master can support with wiring harness design, harness drawings, and manufacturing coordination.
You can also view our sample drawings to get a better idea of the type of documentation we prepare.
We are always happy to discuss upcoming projects and see where we can help, even if the scope is still early and not fully defined yet.
