Testing a residential refrigerator compressor to determine whether it is electrically sound or permanently ruined involves a structured multimeter diagnostic procedure. First, unplug the refrigerator from the wall outlet and turn off power to ensure complete electrical safety. Second, remove the lower rear service panel and take off the plastic cover housing the start relay and overload protector attached to the side of the compressor. Third, pull the relay off and use a digital multimeter set to ohms to test electrical continuity across the three compressor terminal pins in a triangular pattern (Common to Run, Common to Start, Run to Start), and check for ground faults against the copper housing. You can troubleshoot power delivery easily. You can verify compressor health when multimeter resistance readings match manufacturer specifications.
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