Cummins/Onan — Connecting / Disconnecting Batteries
Maintenance
From a Cummins/Onan owner's manual covering: 1.5HJBAA, 2.0HJBAA, 2.5HJBAA, 3.0HJBAA. Check it applies to your exact model before use.
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Before you start
- Battery acid can cause severe burns. Wear safety glasses and protective clothing.
- Lead-Acid Batteries produce explosive hydrogen gas; do not smoke near batteries.
- Damage as a result of reverse polarity is not covered under Warranty.
Procedure
- Always disconnect AC power to the Inverter-Charger and turn off all DC loads before disconnecting battery cables.
- When disconnecting: disconnect the negative (-) cable from the Inverter-Charger and then the Batteries; then disconnect the positive (+) cable from the Inverter-Charger and then the Batteries.
- When reconnecting: reconnect the positive (+) cable at the Batteries and then at the Inverter-Charger; then reconnect the negative (-) cable at the Batteries and then at the Inverter-Charger.
- Always observe proper polarity: Positive (+) to Positive (+) and Negative (-) to Negative (-).
Source: Cummins/Onan owner's 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.