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Cummins/Onan GGDB — Generator Field Voltage Testing and Measurement

For the Cummins/Onan GGDB.

Applies to: Cummins Onan Ggdb

Procedure

  1. Connect AC voltmeter across generator field terminals.
  2. Measure field voltage with generator operating at no load.
  3. Verify voltage output is proportional to field strength.
  4. Note that generator output current is proportional to generator speed.

Tools required

  • AC voltmeter

Source: manual:928-0503D Onan GGDB Service Manual (05-2003).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.