Cummins/Onan — Battery Connections for 24 Volt Systems
Installation · Batteries
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan MDGBA, Cummins/Onan MDGCA, Cummins/Onan MDGCB, Cummins/Onan MDGDA, Cummins/Onan MDGDB, Cummins/Onan MDGGA
Before you start
- Accidental starting can cause severe personal injury or death. Disconnect the negative (−) battery cable first and reconnect it last.
Procedure
- Connect two 12 volt batteries as shown in Figure 8-1.
- Secure the negative battery cable to the starter or to the engine block.
- Remove paint, rust or grease under the connector so it touches bare metal.
- Connect the negative (−) battery cable to the engine last.
Full service-parts list: Cummins/Onan MDGBA →, Cummins/Onan MDGCA →, Cummins/Onan MDGCB →, Cummins/Onan MDGDA →, Cummins/Onan MDGDB →, Cummins/Onan MDGGA →
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.