Stator Shorts

NOTE: Delta windings of 15 SI and 27 SI series alternators cannot be checked for shorts.

To test 10 SI alternator stator windings for shorts, check each of the 3 winding phases, using an ohmmeter reading in tenths of an ohm (0.1 ohm). See Fig 1. Ohmmeter readings for 3 phases should show equal resistance. If not, a short exists and stator must be replaced.

Fig 1: Bench Testing Stator for Shorts Using an Ohmmeter (10 SI Alternators Only)

Courtesy of GENERAL MOTORS COMPANY