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Cummins/Onan DFK series — RECTIFIERS

For the Cummins/Onan DFK series.

Applies to: Cummins Onan Dfk Series

Procedure

  1. 2. No component or terminal of the exciter should show a grounded circuit.
  2. 3. If dc voltage is present at terminals AFI and AF2 in step 1 above, check the alternator for grounds, opens, etc.
  3. 4. Connect exciter leads. If ac voltage drops under load conditions, check the exciter rectifiers. Use a low voltage battery powered "Multimeter" type ohmmeter. Disconnect one lead from, or remove, each rectifier for the test.

Source: manual:960-0002 Onan DFK Install and Operating Manual.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.