Cummins/Onan RGA-IN1 — Testing Rotating Rectifiers
Testing & diagnosis
For the Cummins/Onan RGA-IN1, from the Cummins/Onan service manual.
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Procedure
- Disconnect all leads from assembly to be tested.
- Connect ohmmeter test lead to F1+ stud and other lead to CR1, CR2 and CR3 in turn; record resistance.
- Connect lead to F2- stud and other lead to CR4, CR5, and CR6 in turn; record resistance.
- Reverse ohmmeter leads and record resistance values.
- All resistance readings should be high in one test and low in the other. If high or low in both, rectifier assembly is defective.
- Replace defective rectifier assembly with new identical part.
- Use 23 to 26 inch lbs (2.6 to 2.9 N.m) torque when replacing nuts.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 23 to 26 inch lbs (2.6 to 2.9 N.m)
Source: Cummins/Onan 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.