Essential Guide: Voltage vs. Resistance Measurements in Motor Troubleshooting
When assessing motor health, the location of your test leads profoundly influences what you detect. Voltage readings reveal anomalies upstream of the connection point; any fault that occurs downstream—closer to the motor—will remain hidden. Conversely, resistance measurements expose imbalances caused by faults downstream of the test leads, but will miss issues upstream toward the power source or transformer. Because each test only sees part of the circuit, performing both voltage and resistance checks provides a complete diagnostic picture.
For a deeper dive into power‑circuit testing and troubleshooting, visit the PDMA resource at PDMA Power Circuit Fault Zone.
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