Rectifier Bridge Test
NOTE:
Install NEW bearing at slip ring end whenever generator is reassembled. When disassembling generator, carefully note locations of insulated and uninsulated screws.
NOTE:
Some digital ohmmeters cannot be used to check diodes in rectifier bridge. Consult ohmmeter manufacturer to determine ohmmeter capabilities.
- Scribe end frames to facilitate reassembly. Remove through-bolts and separate end frames. Remove stator. Connect ohmmeter between grounded heat sink and any one of 3 flat metal rectifier bridge terminal connectors and note reading. See Fig 1.
- Reverse ohmmeter leads. A good rectifier bridge will indicate a high and a low reading. If both readings are the same, replace rectifier bridge. Repeat test between grounded heat sink and other 2 flat metal terminal connectors. If readings are the same when leads are reversed at either connection, replace rectifier bridge.
- Repeat test between insulated heat sink and 3 flat metal rectifier bridge terminal connectors. Replace rectifier bridge if readings are the same when leads are reversed at any test connection.
- To reassemble generator, reverse disassembly procedure. Retain brushes with brush retaining pin during reassembly. See Figure. Remove retaining pin after tightening through-bolts.