Cummins/Onan — Battery Connections (Prestart Preparation)
Installation · Starting Battery
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan GGHG, Cummins/Onan GGHH, Cummins/Onan WSG-1068 engine
Before you start
- Accidental starting can cause severe personal injury or death.
- Ignition of explosive battery gases can cause severe personal injury or death.
- Ventilate battery area before working on or near battery. Arcing, flames, pilot lights and sparks can ignite battery gas.
Parts for this job
Part numbers from the service-parts lists for Cummins/Onan GGHG, Cummins/Onan GGHH. Verify against your serial number before ordering; some links are affiliate links.
Procedure
- Make sure the Run/Off/Auto switch on the control panel is set to Off before connecting battery cables.
- Connect the positive battery cable before connecting the negative battery cable to prevent arcing.
- Connect the negative (–) battery cable last to prevent arcing.
- Service the battery as necessary; connect a separate battery charger if an ATS without built-in charge circuit is installed.
Specs & values
- Required battery: 12 Volts DC, Group 31, 1,000 CCA
Full service-parts list: Cummins/Onan GGHG →, Cummins/Onan GGHH →
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.