Volvo Penta Group 23 EDC III — Checking positive output diodes
Testing & diagnosis · Generator output diodes
For the Volvo Penta Group 23 EDC III, from the Volvo Penta service manual.
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Procedure
- Set the multimeter for diode measurement.
- Connect the negative test probe to B+ and the positive test probe to each of the three stator windings.
- Take readings of the three stator windings.
- Switch the test probes and take three more readings.
- One time the instrument should read 400–1200 mV (conducting direction); the other time it should read OL.
Tools required
- Multimeter (diode measurement) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 400–1200 mV conducting direction; OL reverse
Source: Volvo Penta service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.