Where should a technician measure resistance to check the line voltage wiring of a compressor?

Measuring resistance at the load side of the compressor contactor is an important step in diagnosing issues with the compressor. This is because the load side represents the wiring that carries the current to the compressor itself when the contactor is closed. By taking resistance measurements here, a technician can confirm whether the connections are intact and functioning properly.

If the resistance is within an expected range, it indicates that the wiring and connections leading to the compressor are likely in good condition. Conversely, if there is a high resistance reading or an open circuit, it suggests there may be an issue with the wiring or the contactor, potentially leading to compressor malfunction.

In comparison, measuring resistance at the compressor terminals or other components like the capacitor and crankcase heater would provide less relevant information for diagnosing the line voltage wiring because these locations do not directly assess the integrity of the wiring connected to the compressor during its operation.