Cummins/Onan — Maintaining the Battery and Battery Connections
Maintenance
From a Cummins/Onan owner's manual — check it applies to your exact model before use.
Applies to: Cummins/Onan HDKA, Cummins/Onan HDKAJ, Cummins/Onan HDKAK
Before you start
- Arcing at battery terminals, flames or sparks can ignite battery gas causing severe personal injury. Ventilate the 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 which is negative (-) before making connections.
- Always remove the negative (-) cable first and reconnect it last to reduce arcing.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- See Specifications for minimum cold cranking amperes required for starting
Full service-parts list: Cummins/Onan HDKA →, Cummins/Onan HDKAJ →, Cummins/Onan HDKAK →
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.