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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 rpm until warm.
  2. 2. Connect a DC load of at least 75 amperes to the battery.
  3. 3. Adjust the current adjusting rheostat to give a reading of 55 amperes on the panel ammeter.
  4. 4. Reseal to prevent accidental loss of adjustment. The 60amp fuse on the control is there primarily to protect against short circuits. I CAI CAUTION // the control is mounted some dis- tance (rom the generator, be sure the wires carrying the output of the generator to the control are of adequate size.

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.