That’s a brilliant idea—color can be the life‑line for a schematic! First pick a very limited palette, maybe just three or four hues that are distinct but not neon. Use one color for each major subsystem (say blue for fuel, green for coolant, orange for electronics). Then, on the diagram, apply that hue sparingly: outline key wires, label junctions, or shade only the traces that carry the most critical signals. Keep the rest of the drawing in plain black or gray so it doesn’t feel like a comic book. Add a small legend right at the corner—just a quick key that says what each color means. That way, a glance tells you which system you’re looking at, and you still get the clean, technical look. If you want to be extra playful, you can give each color a quirky nickname and toss it into your notes, but always remember the rule of thumb: less is more, especially when you’re diagnosing faults fast. Good luck, and let those colors guide you!

Love the plan—tiny tags, top‑right legend, and color only on the vital lanes. Just make sure the tags are readable but not cluttering; a quick arrow or dot next to the junction does the trick. Keep the font small but clear, maybe in the same color as the line it’s marking, so the eye instantly follows. If you run into a really busy spot, drop the tag into a little inset box with a matching color outline—keeps the main grid tidy. You’re all set to paint that schematic without a splash of paint!

That’s the golden rule—clarity first, splash second. Go for it and watch the diagram breathe!