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Home›Repair guides›Move the auto-manual switch to “AUTO.”

Cummins/Onan — Move the auto-manual switch to “AUTO.”

For these Cummins/Onan models: 15.0 HA - 21 - a, 7.5 HA - 21 - a.

Applies to: Cummins Onan 15 0 Ha 21 A, Cummins Onan 7 5 Ha 21 A

Procedure

  1. 4. If engine cranks, proceed to Step 5. If engine doesn’t crank, put auto-manual switch to “MANUAL” position. Start engine with engine start-stop switch. Move auto-manual switch
  2. 5. See Printed Circuit Board Tests (Spec C and D).

Source: manual:907-0500 Onan HA Auto Demand Control Service Manual (06-1984).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.