Alternator - Delco 21SI Caterpillar


Stator - Test

Usage:

980C 13B



Illustration 1g00722299

(1) Stator

(2) Stator leads

(3) Stator frame

Stator Winding Continuity Test

  1. Connect the multimeter leads between each combination of two stator leads (2) : (A to B), (B to C) and (C to A). Make a note of each measurement.

  1. The three measurements should be approximately 0.063 ohms.

  1. Replace the stator (1) if any of the measurements are incorrect. If a measurement is too low, the stator (1) is shorted. If a measurement is too high, the stator (1) is open.

Stator Winding Ground Test

  1. Set the multimeter to the 20 M ohm resistance scale. Measure the resistance between each stator lead (2) and the stator frame (3) : (A to 3), (B to 3) and (C to 3) .

  1. Each measurement should be greater than 100 K Ohms(0.100 M Ohms).

  1. If any of the three measurements are low, the stator (1) is shorted to the stator frame (3). Replace the stator if a short is measured.
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