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Cummins/Onan — (See method O in procedure section for checking

For these Cummins/Onan models: 300.0 DFT, 350.0 DFU, 350.0 WF, 400.0 DFV, 400.0 WK, 450.0 DFW, 500.0 DFY, 600.0 DWV, YB series.

Applies to: Cummins Onan 300 0 Dft, Cummins Onan 350 0 Dfu, Cummins Onan 350 0 Wf, Cummins Onan 400 0 Dfv, Cummins Onan 400 0 Wk, Cummins Onan 450 0 Dfw, Cummins Onan 500 0 Dfy, Cummins Onan 600 0 Dwv, Cummins Onan Yb Series

Procedure

  1. 15. | Shut off engine. Is the exciter field winding OK? 16 _ E
  2. 16. | Are the rotating diodes CR1, through CR6 on the exciter

Source: manual:900-0192 Onan UV 300-600 KW Generators & Controls Service Manual (01-1975).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.