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Home›Repair guides›Disconnect the starting batteries.

Cummins/Onan AT U C D ‘400 - 4X / 11 10 C — Disconnect the starting batteries.

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

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Procedure

  1. Close cabinet door of automatic transfer switch.
  2. Open automatic transfer switch cabinet door.
  3. Move the operation selector switch to “STOP” (on
  4. Disconnect the starting batteries.
  5. Remove AC line voltage from the automatic
  6. Remove the twist-lock disconnect plug and con-
  7. Rewire the stepdown transformers T2, T3, T4, 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.