Cummins/Onan — Battery Connections (prior to Onan serial number 661047)
Installation
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Procedure
- Connect positive post of one 12 volt battery to forward terminal of series-parallel switch.
- Connect negative post of same battery to grounded terminal of start solenoid.
- Connect positive post of second 12 volt battery to terminal on side of engine starting motor.
- Connect negative post of same battery to rear terminal of series-parallel switch.
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.