To test the start winding for an open, connect the ohmmeter leads to the common terminal and the S terminal. The winding resistance of a single-speed motor may be only one or two ohms, while the resistance of a multi-speed fan motor may be 10 to 15 ohms. The resistance of the run winding of a single-phase motor can vary greatly from one motor to another. The ohmmeter should indicate continuity through the winding. To test the windings for an open, connect one ohmmeter lead to the common motor terminal, and the other meter lead to the run winding. Many single-phase motors have one lead of the run and start windings connected as shown in Figure 11–15. The ohmmeter test can be used to determine if a winding is open or grounded. The stator winding of a single-phase motor is generally tested with an ohmmeter.
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