Battery Cable - Positive

This procedure covers the removal and replacement of the positive battery cable on a 1994-2007 Dodge Ram 2500 with the 5.9L Cummins diesel engine and 4WD.

Warnings

Tools required

Parts

• Positive battery cable assembly × 1 — OEM Mopar or equivalent, specific to Cummins diesel application
• Battery terminal connector bolts (if corroded) × 2 — Use OEM specification
• Cable mounting hardware kit × 1 — Use OEM specification or reuse if in good condition
• Cable ties or routing clips × 5 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition off and remove key
3. Allow engine to cool completely (minimum 2 hours if recently operated)
4. Locate both batteries (dual battery system standard on Cummins diesels) in engine bay on driver side
5. Gather all tools and new battery cable before starting
6. Document or photograph positive cable routing from battery through firewall and to starter motor

Procedure

1. 1

   Disconnect negative battery cables
   Using appropriate socket, loosen and remove the negative terminal bolts from both batteries (if dual battery configuration). Remove negative cables completely and secure them away from battery terminals using zip ties or tape to prevent accidental contact. Wait minimum 2 minutes for electrical system capacitors to discharge.
   Torque spec

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

   Remove air intake components for access
   Remove the air intake tube from the turbocharger inlet to the air filter housing for better access to the battery compartment and positive cable routing. Loosen hose clamps and disconnect any sensors. Set aside components carefully to avoid damage.
3. 3

   Disconnect positive terminal from batteries
   Using appropriate socket, carefully loosen and remove the positive terminal bolts from both batteries. Note that the positive cable may have multiple terminals at the battery post (main cable, jumper cable between batteries, and accessory connections). Remove positive cables from battery posts and immediately cover exposed terminals with non-conductive material.
   ⚠️Keep positive cable ends away from all metal surfaces. Even with negative disconnected, residual charge and accidental grounding can cause sparks or component damage.
   Torque spec

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

   Disconnect positive cable from power distribution center
   Locate the Power Distribution Center (PDC) mounted on driver side inner fender. Remove the PDC cover. Identify the positive cable connection point (typically a large bolt or stud). Remove the connector screws or mounting bolts securing the positive cable lug to the distribution center. Note any additional wires on the same stud.
   Torque spec

   Connector Screws4 Nm (3 lb-ft)

   Module Mounting Bolts8 Nm (6 lb-ft)
5. 5

   Trace and release cable routing clips
   Follow the positive cable from the battery area through the engine bay to the starter motor on the driver side of the engine block. Cut or release all cable ties, routing clips, and bracket bolts securing the cable along its path. Note the exact routing path over the exhaust manifold area and through any protective sleeves or loom.
6. 6

   Disconnect cable at starter motor
   Locate the starter motor on the driver side of the engine block near the transmission bellhousing. The positive cable connects to the starter solenoid with a large nut or bolt. Remove the mounting bolt securing the positive cable terminal to the starter solenoid. Support the cable to prevent it from falling into tight spaces.
   Torque spec

   Module Mounting Bolts8 Nm (6 lb-ft)
7. 7

   Remove old positive cable
   Carefully remove the entire positive battery cable assembly from the vehicle, routing it backward through all mounting points, firewall grommets, and clips. Inspect the routing path and clean any corrosion or debris from mounting surfaces, battery terminals, and connection points using wire brush.
8. 8

   Prepare and inspect new cable
   Compare new positive battery cable to old cable to verify correct length, terminal positions, and connection points. Clean all connection surfaces (battery posts, starter solenoid stud, PDC connection point) with wire brush until bright metal is visible. Apply thin layer of dielectric grease to battery posts and connection surfaces.
9. 9

   Route new positive cable
   Route the new positive battery cable from the starter motor location through the engine bay following the exact path of the original cable. Ensure cable routes away from exhaust manifold (maintain minimum 2-inch clearance), avoids moving components (alternator, belts, pulleys), and follows any protective looms or grommets through the firewall if applicable to your cable configuration.
10. 10

    Connect cable to starter motor
    Install the positive cable terminal onto the starter solenoid stud, ensuring the terminal sits flat against the mounting surface with no gaps. Install mounting bolt and tighten to specification using torque wrench. Verify terminal does not rotate on stud after tightening.
    Torque spec

    Module Mounting Bolts8 Nm (6 lb-ft)
11. 11

    Connect cable to power distribution center
    Route cable to PDC and install the cable terminal onto the appropriate stud or connection point. Stack any additional wire terminals that were noted during removal in the same order. Install connector screws or mounting bolts and tighten to specification. Reinstall PDC cover.
    Torque spec

    Connector Screws4 Nm (3 lb-ft)

    Module Mounting Bolts8 Nm (6 lb-ft)
12. 12

    Secure cable routing
    Install all bracket bolts, routing clips, and cable ties to secure the positive cable along its entire length. Ensure cable cannot contact exhaust components, moving parts, or sharp edges. Verify adequate slack at connection points to prevent tension on terminals during engine movement.
13. 13

    Connect positive terminals to batteries
    Install positive cable terminals onto battery posts, ensuring proper seating. If dual battery configuration, verify jumper cable is correctly positioned between batteries. Hand-tighten terminal bolts, then torque to approximately 11 Nm / 8 ft-lbs using torque wrench — verify against factory service manual. Apply anti-corrosion spray or terminal protector to exposed connections.
    ⚠Do not overtighten battery terminal bolts as this can crack the battery post or damage the terminal. Use torque wrench to ensure proper 6.0 Nm specification.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)
14. 14

    Reconnect negative battery cables
    Install negative battery cable terminals onto both battery negative posts. Hand-tighten terminal bolts, then torque to specification. Verify all battery connections are tight and properly seated.
    Torque spec

    Battery Terminal Bolts6 Nm (4 lb-ft)
15. 15

    Reinstall air intake and verify system
    Reinstall air intake tube and reconnect any sensors that were disconnected. Tighten all hose clamps. Verify all tools and materials are removed from engine bay. Turn ignition to ON position (do not start engine) and verify instrument cluster illuminates properly and no warning lights indicate electrical faults.

Reassembly

1. Ensure all cable routing clips and ties are secure and cable cannot contact hot or moving components
2. Verify battery terminal connections are clean, tight, and properly torqued to prevent voltage drop issues common with high-amperage diesel starting systems
3. Double-check that positive cable maintains adequate clearance from exhaust manifold throughout entire routing path

Verification

• Turn ignition to ON position and verify all electrical systems function (lights, radio, gauges, HVAC)
• Start engine and verify starter engages normally without hesitation or clicking
• Check for voltage drop: with engine running, measure voltage at battery positive terminal and at starter solenoid terminal - difference should be less than 0.5 volts
• Inspect all connection points for signs of heating, sparking, or loose connections after initial start
• Verify no electrical warning lights remain illuminated on instrument cluster
• Test high-draw electrical systems (headlights, blower motor on high) with engine running to ensure adequate current delivery
• After first drive cycle, re-inspect all cable connections and routing to ensure nothing has shifted or loosened

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