Cummins/Onan B43 / B48 — Battery Inspection
Maintenance
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Before you start
- Ignition of explosive battery gases can result in severe personal injury. Do not smoke or allow any ignition source near the battery.
Procedure
- Check battery cells with a hydrometer; specific gravity should be approximately 1.260 at 77 deg F (25 deg C).
- If one or more cells are low on water, add distilled water and recharge.
- Keep battery case clean and dry.
- Keep battery terminals clean and tight; push cable terminal down flush with or slightly below top of battery post.
- Coat terminals with a light application of petroleum jelly or grease to retard corrosion.
Tools required
- hydrometer Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Specific gravity approximately 1.260 at 77 deg F (25 deg C)
Full service-parts list: Cummins/Onan B48 →
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.