Description
Engine wiring harness to the negative battery terminal for Citroën and Peugeot vehicles.
This negative battery harness (ground/earth cable) is a direct-fit replacement designed for Citroën and Peugeot engines. Supplied under OEM-related references 9661191580, 9664252080 and 5638SC, it restores reliable grounding between the battery negative pole and the engine/chassis electrical system. Ideal for professional workshops and DIY mechanics who need a durable, exact-fit part that prevents intermittent electrical faults, poor starter performance and charging-system irregularities.
Key Benefits
- Direct replacement for original Citroën/Peugeot grounding harnesses — fast, no-modification install.
- Prevents voltage drops and intermittent earth connections that cause starter, charging and electronic faults.
- Robust construction to resist heat, vibration and routine under-hood contaminants.
- Commonly cross-referenced by part numbers for quick search and identification.
Technical Information
- Manufacturer: Stellantis
- Model: Citroën C4; Citroën C4 Picasso; Peugeot 3008 I; Peugeot 308; Peugeot 5008 I
- Product Codes: 9661191580; 9664252080; 5638SC
- Additional Numbers: 961191580
Function
The harness provides the main negative (earth) connection from the battery to the engine block and chassis ground points. A solid, low-resistance earth path is essential for correct starter operation, stable charging from the alternator and reliable operation of vehicle electronics and sensors.
How To Replace
Recommended for experienced mechanics and competent DIYers. Basic replacement steps:
- Park the vehicle on level ground, switch off ignition and remove key.
- Disconnect the negative battery terminal first to avoid short circuits; keep the battery disconnected during the swap.
- Locate the old harness routing from the battery negative pole to its engine/chassis attachment points and note or photograph routing and clip positions.
- Unfasten terminal clamps, clips and bolts securing the harness; remove the old harness.
- Install the new harness following the original routing, secure all clamps and fasteners, and ensure correct seating on contact surfaces.
- Tighten terminal clamps and mounting bolts to manufacturer specifications and reconnect the battery last.
- Start the engine and verify stable idle, charging voltage and absence of electrical fault indicators. If faults persist, inspect connections and grounds, and scan for diagnostic codes.
Installation Recommendation
Always disconnect the battery before work and follow the vehicle manufacturer’s procedures. Clean mating surfaces to remove corrosion and ensure secure metal-to-metal contact. Replace any damaged fasteners or corroded terminals. Tighten clamps and ground bolts to the correct torque values as specified by the manufacturer. Use appropriate protective measures against abrasion and routing near hot or moving parts.
Why This Part Commonly Fails
- Corrosion At Terminals: Exposure to moisture and road salts causes increased resistance or open circuits at connection points.
- Mechanical Wear And Vibration: Repeated engine movement and vibration can chafe insulation or break conductors where the harness is unsecured.
- Heat And Chemical Exposure: Proximity to hot engine components, oil or coolant leaks accelerates insulation degradation.
- Loose Or Damaged Fasteners: Poor clamping or missing clips leads to intermittent contact and electrical faults.
Service Life
There is no fixed replacement interval. Properly installed OEM-type harnesses often last many years, but replacement is recommended immediately if signs of corrosion, visible wire damage, poor contacts or intermittent electrical issues occur.
