The answer to 'how to test electrical wiring' is to use a multimeter to check for proper voltage, current, and resistance in your home's electrical system. This allows you to identify any issues with wiring, outlets, or circuits before they become a safety hazard.
Start by turning off the power to the area you want to test at the circuit breaker. Then use your multimeter to check the voltage at outlets and light fixtures, ensuring it matches the expected voltage for your home (typically 120V). You can also test for continuity, which indicates a complete circuit. If you find any issues, it's best to call a licensed electrician to diagnose and repair the problem.