Cummins/Onan 1400 / 2.0UF-232S/32 — Checking Automatic Control for Proper Polarity - 2.0S-232/32A

Testing & diagnosis · Control box terminals A1/A2, voltage regulator

For the Cummins/Onan 1400 / 2.0UF-232S/32, from the Cummins/Onan operator's manual.

Applies to: Cummins/Onan 1400

Procedure

1. Remove the 60 amp cartridge type fuse from the control box.
2. Connect an accurate DC voltmeter across the Al and A2 terminals in the control box with Meter '+' lead to Al and Meter '-' lead to A2.
3. Slowly bring generator up to a speed between 1500 and 2500 rpm observing the voltmeter.
4. If the voltmeter reads backwards check all wiring and repolarize; the reading should be 38 volts.
5. Turn the voltage adjustment rheostat to give a voltmeter reading of 38 volts.
6. Stop the generator, disconnect the voltmeter and reinstall the 60 ampere fuse to its clips.

Full service-parts list: Cummins/Onan 1400 →

Source: Cummins/Onan operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

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