Question
How to diagnose faulty automotive power supply relay?
Answer
Test relay coil resistance and monitor voltage output.
Explain
A faulty power supply relay causes power loss to electrical systems. CHEPQ tools test relay coil resistance (50-100Ω) and monitor voltage output (12V when activated)—replacing the relay restores power supply.
Related Diagnostic Guide
To explore this topic in a broader system-level diagnostic context:
Related Guide: Battery, Power Supply & Ground Integrity Diagnostics
Recommended Diagnostic Solutions
To apply the diagnostic concepts discussed above in real-world scenarios, explore our full range of professional automotive diagnostic tools. These solutions are designed to support battery testing, system diagnostics, and data analysis for modern vehicles and workshop environments.
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