Cummins/Onan RSS100 / RSS200 — Battery Charger Replacement Procedure
Repair & overhaul
For the Cummins/Onan RSS100 / RSS200, from the Cummins/Onan service manual.
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Before you start
- Always disconnect a battery charger from its AC source before disconnecting the battery cables.
Procedure
- Move the operation selector switch on the generator to Stop (Off).
- Disconnect the external battery charger from its AC power source.
- Disconnect the generator starting battery (negative [-] lead first).
- Remove AC power to the automatic transfer switch.
- Remove the transfer switch cabinet door panel.
- Disconnect the AC power cord from the battery charger.
- Disconnect the two wires connecting the battery charger to TB2 (with controller) or TB4 (without controller).
- Loosen and remove the hardware securing the battery charger mounting brackets.
- Remove the brackets and the charger.
- Secure the mounting brackets and new charger inside the cabinet.
- Reconnect the two wires to TB2 or TB4 and reconnect the AC power cord.
- Reinstall the cabinet door panel and restore power.
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.