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Cummins/Onan — Adjust as follows:

For these Cummins/Onan models: 1400, 2.0UF-232S/32.

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Procedure

  1. 1. Run generator at a speed between 1500 and 2500
  2. 2. Connect a DC load of at least 75 amperes to the
  3. 3. Adjust the current adjusting rheostat to give a
  4. 4. Reseal to prevent accidental loss of adjustment.

Source: manual:943-0004 Onan UF Battery Charger Manual(3-1077).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.