Use dedicated contact cleaners rather than abrasive paper on delicate switches. For bullet connectors common in British classics, a light coating of dielectric grease can prevent future oxidation.
Use a multimeter to check for resistance across old wires. If a headlight switch receives 12V but the bulb only sees 10V, the wiring or switch is acting as a resistor and needs replacement. Step-by-Step Upgrading
This guide provides essential strategies for maintaining and upgrading the electrical systems of vintage vehicles, ensuring reliability without compromising original character.