Stator Opens
NOTE:
Delta windings of 15 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 shorted.
Check 10 SI stator for open condition with 110 volt test lamp or ohmmeter set to x 15 scale. See Fig 1 . Attach leads to any two stator leads, checking each pair of stator leads in succession. If lamp fails to light or meter reading is high (infinite), windings are open. Replace stator.