UMATT · ELECTRICAL SUBSYSTEM
Our UMATT team is currently building the Sevcon harness. My contribution includes interpreting the existing electrical documentation, researching connectors and supporting components, and helping assemble and document the harness in RapidHarness. This subsystem is intended to join the vehicle’s other harnesses in a larger main wiring spine.
Collaborative build
Sevcon harness
Sevcon R assembly drawing
Wire runs, branch points, and connector callouts
PROJECT DOCUMENTATION
RapidHarness brings the wiring table, bill of materials, physical routing, and connector pinouts into one coordinated package to support our ongoing build. The opening crops highlight the working detail; the complete views preserve the full technical context.
Routing and connector relationships
Wire colours and conductor names
01 / Wiring table — sources, destinations, wire colors, gauges, and termination notes
02 / Bill of materials — connectors, contacts, seals, coverings, and wire specifications
03 / Assembly drawing — harness branches, connector pinouts, and covering callouts
The pin assignments and electrical intent come from the team’s existing schematics. My role is to help turn that information into a practical harness: identify the supporting hardware, organize it into a buildable package, and work with the team to wire the connections accurately.
Hands-on contribution
My contribution includes interpreting the provided schematics, researching connectors and consumables, developing the bill of materials, and helping the team build the Sevcon harness.
Collaborative context
We are currently building the harness as a team, working within the wider electrical team’s existing system decisions. The Sevcon harness is one part of the larger vehicle architecture.
The UMATT team with the quarter-scale tractor and ballast cart the harness was built for
The Sevcon harness concentrates one local set of motor-controller connections. Its value comes from being clear at the interface: documented conductors, connector references, and component choices make it easier to combine with the other sub-harnesses that will form the vehicle’s main wiring loom.
Existing schematics
Pinouts and electrical intent supplied by the broader system design.
Sevcon sub-harness
Currently being built by our team, with supporting research and RapidHarness documentation.
Main wiring spine
Future integration with the vehicle’s remaining power, signal, and control harnesses.
Interpret the source
Follow existing schematics and translate their connection intent into a practical harness layout.
Research the hardware
Identify compatible connectors, contacts, seals, wire, sleeving, and coverings needed to complete the assembly.
Build and document
Work with the team to wire the harness according to the existing schematics and keep the RapidHarness documentation aligned as the build progresses.
The ongoing project combines schematic interpretation, component research, hands-on assembly, documentation, and coordination within the wider team.
Schematic interpretation
Following established pinouts and connection intent accurately.
Component research
Selecting compatible connectors, contacts, seals, wire, and coverings.
Harness wiring
Turning documented connections into a physical Sevcon assembly.
BOM development
Recording manufacturers, part numbers, quantities, and usage clearly.
Technical documentation
Coordinating drawings, wiring tables, and connector information.
Team integration
Working within decisions and interfaces owned by the wider UMATT team.
Harness work is as much about preserving system intent as it is about making physical connections. A clear BOM, consistent conductor information, and readable connector references reduce ambiguity for the people who will assemble, inspect, revise, and eventually integrate the subsystem.
PRACTICAL TAKEAWAYS
• Respect existing system decisions before changing an interface.
• Research the complete connector ecosystem, not only the housing.
• Treat documentation as part of the physical build.
• Design sub-harnesses with their eventual integration path in mind.
Our team is in the process of building the Sevcon harness, using a wiring table, researched bill of materials, assembly drawing, and connector pinout references to guide the work. The build is ongoing, with eventual integration into UMATT’s wider vehicle harness architecture in mind.
A small harness can expose the full engineering chain: interpret system documentation, resolve real component constraints, build accurately, and leave behind information the next team member can trust. This work demonstrates practical electrical integration inside a collaborative vehicle project.
View the rest of my work or get in touch to discuss practical electrical integration.