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Cummins/Onan AT U C D ‘400 - 4X / 11 10 C — replace with 322-0126 and 322-0127 lamps

For the Cummins/Onan AT U C D ‘400 - 4X / 11 10 C.

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Procedure

  1. Close the meter-lamp panel and secure the top
  2. 400 ampere AT only: Close the left cabinet door.
  3. Close the control accessory panel and reconnect
  4. Connect a 24-volt battery and restore AC line
  5. Move the operation selector switch to “RMT” (on
  6. Close the cabinet door.
  7. 15 and 20-25.
  8. Move the operation selector switch on the engine
  9. Disconnect the starting batteries.
  10. Remove AC line voltage from the automatic
  11. Open the automatic transfer switch cabinet door.
  12. Remove the remote start wire leads between the
  13. Remove the 300-0937 blank (spare) module 9 and

Source: manual:962-0500 Onan AT (spec A-C) Transfer Switch Service Manual (08-1979).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.