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Caterpillar — Repair: Check the jumpers between the following

A Caterpillar service procedure — check it applies to your exact model before use.

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Procedure

  1. A. Make sure that the generator set is off.
  2. B. If the generator uses Power Transformers (PT)
  3. C. Verify that sensing wires 20, 22, and 24

Source: manual:CAT VR6 Service 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.