6.7L Cummins Electrical Equipment – Battery Cables and Connections – Initial Check

Inspect the battery terminals for loose, broken, or corroded connections.
Repair or replace broken cables or terminals.

If the connections are corroded , remove the cables and use a battery brush to clean the cable and battery terminals.
Install and tighten the battery cables.
Apply a light coating of grease to the battery terminals to prevent corrosion.