Automotive wiring guides for project cars

Clear explanations for planning circuits, choosing components, and documenting a build. A little know-how for your next project.

How to label automotive wires so repairs stay readable

A clear wire-labelling system connects the marks on the harness to the circuit diagram, connector schedule, and future fault-finding work.

A practical fuse-sizing process for project cars, without relying on a universal wire table or a fixed percentage rule.

Automotive relay types explained: SPST, SPDT, 4-pin, 5-pin, changeover, latching, diode, resistor, and solid-state relays.

A practical comparison for builders choosing between manufacturing-oriented harness software and an automotive diagram editor.

A factual comparison of an automotive-focused wiring tool and a broad browser-based diagramming platform.

A methodical way to trace an automotive circuit without confusing a schematic with the vehicle's physical wire layout.

Draw wiring diagrams with Apple Pencil at the bench. Pick up where you left off on the web.