You should have an infinite OL resistance to ground. Only asked to check compressor for grounded reading and thats it. If the tester reads voltage when the two probes are in the top two slots but it does not read voltage through either slot when you place the probe in the ground hole, then the receptacle is not grounded. First, let me say that a short to ground on a compressor is most often not a defect in the manufacture of the compressor, but deficiencies elsewhere in the system. got a 10,000 ohm resistance from each leg to ground. To check short to ground with a multimeter, you need to measure resistance. Remove all of the wires off the terminals. We performed an acid test on the refrigerant and found it to be slightly acidic. Checking the Compressor Windings. Determine which side is the load side or compressor side of the contactor. So verify how the technician determined the "grounded compressor". This will only work for single phase compressors. Checked it and sure as shit. If it is both, you will need to replace the compressor. You should check all of the remaining receptacles in the vicinity to find out whether this is an isolated incident or there is a larger concern. Edit: After years of using the Supco M500 it HAS failed me many times. Now if you check compressor motor windings and not find any problem and still compressor did not run then change the capacitor and if still compressor not working then check the overload protector. Keep the one lead on ground and check all wires leading to the compressor with the other. With a multi-meter in the OHM position put one lead to each of the wires on the compressor side of the contactor and the other lead to ground or the equipment frame. A grounded compressor does not indicate a burnout but is a strong indication of a significant problem. If the technician checked the compressor wires to ground using an Ohm Meter and found them to be ZERO ohms, then the windings are shorted to ground and there is no way that it will work. Do not recommend for compressor troubleshooting. Some technicians arrive on a job, see a defective component, replace the component, start the system up and leave. Take an Ohmmeter and attach one probe to T1 then take the other probe and touch it to the metal housing of the HVAC system, the housing of the compressor, or the copper pipe. So I did what they wanted. Make Sure the Ohmmeter is in the 1000 scale. 3 Phase Compressor Internal Troubleshooting: Checking a Short to Ground- Turn the Power off. A compressor must be replaced with a short to ground. The more resistance, the harder it is for a current to pass through the conductor. You should get no resistance, or a reading of 0.L. Electrical resistance is literally the difficulty that electricity has to get through a component, called a conductor. 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