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Perkins — OFF position.

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

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Procedure

  1. Disconnect the negative battery cable from the
  2. Disconnect the J1/P1 connectors from the ECM.

Source: manual:Perkins Operation and Maintenance Manual 1106D Industrial Engine.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.