Cummins/Onan 15.0 HA / 7.5 HA — Load Sensor Board Component Tests (Spec A and B)
Testing & diagnosis
For the Cummins/Onan 15.0 HA / 7.5 HA, from the Cummins/Onan service manual.
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Procedure
- Place the control in the MANUAL position if the sensor board is mounted in the control.
- Check components starting at the left side of the board with an ohmmeter set at R X 100 scale.
- Check the first resistor, the rheostat, the rectifier, the Zener diode, the transistor and the remaining resistors.
- Replace any component that does not meet its specified resistance.
Tools required
- ohmmeter Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.