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Home›Repair guides›2. Apply a load and remove jumper while generator set is running with switch at “AUTO.” If

Cummins/Onan — 2. Apply a load and remove jumper while generator set is running with switch at “AUTO.” If

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. 3. While generator set is running with a 100-watt minimum load, measure output voltage of transformer T1 at terminals on load sensor amplifier. Should be 2 to 3 volts AC.
  2. 4. Shut off generator set and use procedures under Load Sensor Board Component Tests (Spec A and B).

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.