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Home›Repair guides›6. With ahydrometer, check battery specific gravity. Check battery voltage at control B+ terminal.

Cummins/Onan — 6. With ahydrometer, check battery specific gravity. Check battery voltage at control B+ terminal.

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. 7. Check load circuits. Disconnect load wires from control and substitute another load (such as a 100-watt lamp). If generator set starts with this load, check for problem in load circuits.
  2. 8. Check if bilge blower is operating. If itis, wait until the end of bilge blower operation to see if unit starts.

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.