Cummins/Onan — Testing Bridge Rectifier
Testing & diagnosis · Bridge rectifier assembly
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MCCK
Before you start
- The bridge rectifier can be mounted in four directions, of which only one will work.
Procedure
- Loosen the screw to remove the bridge rectifier assembly.
- Disconnect the nylon connector, noting the polarity marking of the bridge rectifier assembly and connector.
- Pull the assembly out from the end bell and remove the bridge rectifier from its case.
- Use an ohmmeter set to the R x 1 scale to test the bridge rectifier.
Tools required
- Ohmmeter (R x 1 scale) Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- A-B 8 Ohms; A-D 8 Ohms; B-C 8 Ohms; D-C 8 Ohms; B-A Infinity; D-A Infinity; C-B Infinity; C-D Infinity
Full service-parts list: Cummins/Onan MCCK →
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.