Cummins/Onan — Battery Connections (effective 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 terminal of one battery to lower left terminal on series-parallel magnetic switch.
- Connect negative terminal of same battery to upper right terminal on series-parallel magnetic switch.
- Connect positive terminal of second battery to upper left terminal on series-parallel magnetic switch.
- Connect negative terminal of second battery to starter ground terminal.
- Connect lower right terminal on series-parallel magnetic switch to field terminal on starter.
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.