Remove and replace the negative battery cable assembly, including all ground connections to the engine block, chassis, and body on a 2014 Ram 2500 with 6.7L Cummins diesel engine.

Warnings

Tools required

Parts

• Negative battery cable assembly × 1 — Use OEM specification - Mopar 68203392AA or equivalent
• Battery terminal cleaner spray × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn off all electrical accessories and remove key from ignition
3. Allow engine to cool if recently operated
4. Open hood and secure with prop rod
5. Identify all ground connection points: battery negative terminal, engine block ground, chassis ground near battery tray, and body ground connections

Procedure

1. 1

   Disconnect negative battery terminal
   Loosen the 10mm bolt on the negative battery terminal clamp. Do not allow the terminal to contact the battery post once loosened. Move the cable end away from the battery and secure it so it cannot accidentally contact the terminal during the repair.
   Torque spec

   Battery Terminal Bolts6 Nm (4 lb-ft)
2. 2

   Remove engine block ground connection
   Locate the negative cable ground connection on the driver's side of the engine block near the bell housing. Remove the 13mm ground cable bolt securing the cable lug to the engine block. Note the exact position and orientation of any additional ground straps or wires attached at this location.
   ℹ️Multiple ground straps may share this connection point - take a photo before disassembly
   Torque spec

   Ground Cable Bolt18 Nm (14 lb-ft)
3. 3

   Disconnect chassis ground near battery
   Locate the chassis ground connection point on the driver's side frame rail or inner fender near the battery tray. Remove the 13mm ground bolt securing the negative cable to the chassis. This is typically a painted surface that requires a clean metal-to-metal connection.
   Torque spec

   Ground Bolt18 Nm (14 lb-ft)
4. 4

   Remove additional ground strap connections
   Identify and remove any additional ground straps connected between the engine, body, and chassis. These are typically secured with 10mm or 13mm bolts. Common locations include the intake manifold to firewall, and engine block to frame rail. Mark or photograph each location for proper reinstallation.
   Torque spec

   Ground Strap Bolts12 Nm (9 lb-ft)
5. 5

   Remove cable routing clips and fasteners
   Trace the entire negative cable assembly from battery to all ground points. Remove any plastic clips, cable ties, or mounting brackets securing the cable to the vehicle. Note the exact routing path to ensure proper reinstallation.
6. 6

   Remove complete negative cable assembly
   Once all connections and fasteners are removed, carefully extract the complete negative battery cable assembly from the vehicle. Inspect the old cable for signs of corrosion, fraying, or damage that may have necessitated replacement.
7. 7

   Clean all ground contact surfaces
   Using a wire brush, thoroughly clean all ground contact points on the engine block, chassis, and body where the cable lugs attach. Remove all paint, rust, corrosion, and debris to ensure bare, clean metal. Clean the battery terminal post with a battery terminal cleaner tool or wire brush.
   ⚠This is the most critical step - poor ground connections cause the majority of electrical issues on Cummins diesel trucks
8. 8

   Install new cable to engine block ground
   Position the new negative cable's ground lug onto the cleaned engine block mounting point. Ensure any additional ground straps are properly layered in their original configuration. Install and hand-tighten the ground cable bolt, then torque to specification.
   Torque spec

   Ground Cable Bolt18 Nm (14 lb-ft)
9. 9

   Install chassis ground connection
   Attach the negative cable to the cleaned chassis ground point on the frame rail or inner fender. Ensure the cable lug makes full contact with bare metal. Install the ground bolt and torque to specification.
   Torque spec

   Ground Bolt18 Nm (14 lb-ft)
10. 10

    Reconnect additional ground straps
    Reinstall all additional ground straps between engine, body, and chassis in their original locations. Ensure clean metal-to-metal contact at each connection point. Torque all ground strap bolts to specification.
    Torque spec

    Ground Strap Bolts12 Nm (9 lb-ft)
11. 11

    Route and secure cable assembly
    Route the new negative cable assembly along the original path, ensuring it does not contact any sharp edges, hot exhaust components, or moving parts. Reinstall all routing clips and mounting brackets. Verify adequate slack for engine movement but no excessive looseness.
12. 12

    Connect negative terminal to battery
    Clean the battery negative terminal post one final time. Position the cable terminal onto the battery post and ensure it is fully seated. Apply a small amount of dielectric grease to the connection if desired. Install the terminal bolt and torque to specification - do not overtighten as this can damage the terminal.
    ⚠Overtightening battery terminal bolts can crack the terminal clamp or damage the battery post
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)

Reassembly

1. Verify all ground connections are tight and making good metal-to-metal contact
2. Ensure negative cable is properly routed and secured away from heat sources and moving components
3. Double-check that no tools or hardware were left in the engine compartment

Verification

• Test all electrical systems including lights, horn, power windows, and accessories to verify proper operation
• Start the engine and verify proper cranking speed and immediate start - sluggish cranking indicates poor ground connections
• Check for any warning lights on the instrument cluster; some modules may need to relearn or initialize
• Use a multimeter to verify battery voltage at idle (should read approximately 13.8-14.4 volts with engine running)
• Verify no voltage drop between battery negative terminal and engine block ground (should be less than 0.1 volts)
• Road test vehicle and confirm all electrical systems, gauges, and accessories function normally

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