Stator Opens

NOTE: The delta windings of 15 SI, 17 SI, and 27 SI series alternators cannot be checked for open circuits. However, if all other electrical checks are normal and generator fails to supply rated output, but will supply at least 10 amps, windings are probably defective.

To check for open conditions of 10 SI and 12 SI stators, use an ohmmeter set on x1000 scale. Attach ohmmeter leads to any two stator leads. Check each combination of stator leads in succession. See Figure. If any of ohmmeter readings are high (infinity), a winding is open. Replace stator assembly.