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Cummins/Onan AT U C D ‘400 - 4X / 11 10 C — connections on the transformer for the nominal

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

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Procedure

  1. Close the control accessory panel.
  2. Reconnect the twist-lock disconnect plug.
  3. Restore AC line voltage to the automatic transfer
  4. Move the operation selector switch to “RMT” (on
  5. Close the cabinet door.
  6. Open the automatic transfer switch cabinet door.
  7. Move operation selector switch to, “STOP” (on
  8. Disconnect the starting batteries.
  9. Remove AC line voltage from the automatic
  10. Remove the twist-lock disconnect plug and open
  11. Remove the wire lead from transformer T1 ter-
  12. Remove the wire lead from resistor R1 terminal
  13. Remove the 24-volt battery charger module 6
  14. Remove the 24- to 12-volt converter module 5
  15. Spec A and B only: Remove the 24-volt, start-stop

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.