CHARGING SYSTEM — Alternator — Stator Check (Cont'd) + Diode Check
EL-29prose procedureDiodes are part of a one-piece bridge assembly — failed diodes mean replacing the whole rectifier.
Stator Check (Cont'd)
Stator — ground test
- 1Ground test. Continuity exists → Replace stator.
Diode Check
MAIN DIODES
NOTE
Use an ohmmeter to check condition of diodes as indicated in chart below. If any of the test results is not satisfactory, replace diode assembly.
Main diode continuity matrix
Positive side
Ohmmeter (+) probePositive diode plate
Ohmmeter (−) probeDiode terminals
ContinuityYes
Positive side
Ohmmeter (+) probeDiode terminals
Ohmmeter (−) probePositive diode plate
ContinuityNo
Negative side
Ohmmeter (+) probeNegative diode plate
Ohmmeter (−) probeDiode terminals
ContinuityNo
Negative side
Ohmmeter (+) probeDiode terminals
Ohmmeter (−) probeNegative diode plate
ContinuityYes
SUB-DIODES
Sub-diodes — continuity
- 1Attach ohmmeter's probe to each end of diode to check for continuity. Continuity is N.G. → Replace diode assembly.