Power Supply Overview

This guide outlines the custom power supply for this build, covering key design decisions, wiring tips, pros and cons, and lessons learned.

PMU Module vs. Fuse and Relay Box

I originally designed a fuse-and-relay box to fit inside a sub-frame tray. In retrospect, a power management unit (PMU)—for example, the ECUMaster PMU16 —would have simplified the setup.

The PMU16 communicates over CAN and pairs nicely with most ECUs, including FuelTech. Its main drawback is cost, but it eliminates the complexity of a separate fuse and relay arrangement. I may upgrade later, but for now I’m running the fuse-and-relay box.

Custom 3D-Printed Sub-Frame Trays

I designed a PLA holder to organize all fuses and relays. After several iterations, I achieved a precise fit for every terminal.

To mount the holder, I fabricated a three-piece tray to replace the stock sub-frame panel, splitting it to match my printer’s build volume. Detailed models and build notes are in the Modification Wiki.

Continue to the following sections for wiring diagrams, component lists, and performance notes. As always, if you have a question or think something needs to be explained further or in more depth, please reach out and I will do my best to explain further and update the articles.