What should be checked first when troubleshooting an electrical issue with low-voltage systems?

When troubleshooting an electrical issue with low-voltage systems, checking the power supply first is crucial because it serves as the foundation for the entire system's functionality. If there is no power or if the power supply is malfunctioning, the entire system will be inoperative, making it impossible to determine if other components, such as ground connections, wire integrity, or load capacity, are functioning correctly.

Beginning with the power supply allows you to rule out the most common cause of electrical issues—insufficient or interrupted power. Once the power supply is verified, you can then proceed to investigate other potential issues such as grounding, wiring problems, or load issues that might affect the system's performance. Establishing the presence and quality of the power supply sets the stage for a more efficient and structured troubleshooting process.