Cummins/Onan — Maintaining Battery and Battery Connections
Maintenance · Starting battery
From a Cummins/Onan operator's manual covering: 5.5 HGJAA, 5.5 HGJAB, 5.5 HGJAC, 6.5 HGJAA, 6.5 HGJAB, 6.5 HGJAC, 7.0 HGJAA, 7.0 HGJAB, 7.0 HGJAC. Check it applies to your exact model before use.
Applies to: Cummins/Onan HGJAA, Cummins/Onan HGJAB, Cummins/Onan HGJAC
Before you start
- Arcing at battery terminals can ignite battery gas causing severe personal injury.
- Ventilate battery area; wear safety glasses; do not smoke.
Procedure
- Keep the battery case and terminals clean and dry and the terminals tight.
- Remove battery cables with a battery terminal puller.
- Make sure which terminal is positive (+) and negative (−) before making connections.
- Always remove the negative (−) cable first and reconnect it last to reduce arcing.
Tools required
- Battery terminal puller Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Full service-parts list: Cummins/Onan HGJAA →, Cummins/Onan HGJAB →, Cummins/Onan HGJAC →
Source: Cummins/Onan operator'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.