Product Overview

Replacement left rear tail light assembly designed for Citroën C4 5-door models (first generation). This unit restores rear illumination and signaling functionality after damage or wear. Ideal for professional mechanics and DIY enthusiasts looking for a direct-fit OE-style replacement. Commonly searched under OE numbers 9655864080 and 6350T8.

Key Features

• Direct Fit For Citroën C4 First Generation 5-Door
• Complete Rear Lamp Assembly (Housing, Lens And Bulb Sockets As Supplied)
• OE Reference Numbers Included For Easy Search And Matching
• Durable Construction Designed To Withstand Road Vibration And Weather
• Wiring And Socket Kit Available Separately If Required

Technical Information

• Manufacturer: Stellantis (Citroën)
• Model: Citroën C4 I 5-Door (First Generation)
• Product Codes: 9655864080, 6350T8
• Other Numbers: 6350T8 | 9655864080

Fitment Notes

Fits left side (driver side in left-hand drive vehicles) of Citroën C4 5-door hatchback, first generation. Always verify the shape, mounting points and connector type against the unit being replaced before installation to ensure correct fitment.

Installation Recommendations

• Park The Vehicle On A Level Surface And Switch Off The Ignition Before Starting Work.
• Open Tailgate And Remove Interior Trim To Access Fasteners Holding The Lamp Assembly.
• Disconnect The Electrical Connector Carefully To Avoid Damaging Pins Or Wiring.
• Remove Fasteners (Screws/Clips), Withdraw Old Lamp, And Replace With New Assembly Ensuring Correct Alignment.
• Reconnect The Electrical Connector, Refit Trim, And Test All Light Functions (Brake, Tail, Indicator, Reverse) Before Finishing.
• Replace Bulbs And Seals If They Show Signs Of Wear; Use Correct Bulb Types As Specified For The Vehicle.
• Check For Proper Sealing Around The Unit To Prevent Water Ingress After Installation.

Why The Part Commonly Fails

• Impact Damage From Rear Collisions Or Minor Bumps Leading To Cracked Lens Or Broken Mounting Tabs.
• Water Ingress Causing Corrosion Of Contacts, Socket Failure, Or Short Circuits.
• Age-Related Degradation Of Seals And Plastics, Resulting In Fogging Or Reduced Light Output.
• Bulb Or Socket Wear From Thermal Cycling And Vibration.
• Poorly Secured Mounting After Previous Repairs Leading To Stress And Premature Failure.

Additional Advice

When replacing the rear lamp, inspect the wiring harness and connector for corrosion or damage. If sockets are brittle or corroded, consider replacing the socket/wiring kit to ensure reliable long-term operation. For best results, use compatible bulbs and ensure all seals and gaskets are correctly positioned to maintain weatherproofing.

This rear lamp wiring harness is intended for mechanics and DIY enthusiasts who need a direct replacement for damaged or corroded tail-light connections on the Citroën C4 (five-door, first series). The harness routes power and signal to the rear combination lamp assemblies (tail, brake, indicator, reverse and rear fog where applicable) and provides the factory-style connectors for a straightforward swap. Common search terms include rear lamp wiring harness, tail light wiring loom, Citroën C4 wiring harness and the product codes 6350T8, 6351T8, 6534PC.

Technical Information

• Manufacturer: Stellantis (Citroën/Peugeot)
• Model: Citroën C4 I, 5-Door, First Series
• Product Codes: 6534PC
• Additional Numbers: 6350T8, 6351T8

Function And Application

The harness supplies electrical power and signal paths to the left and right rear light clusters. It contains individual circuits for tail lights, brake lights, indicators, reverse lights and rear fog where fitted. It is designed to mate with the original lamp connectors and the vehicle wiring loom to restore reliable lighting operation after connector damage or wiring failure.

Replacement Procedure

Replacement is typically performed as follows:

• Disconnect the negative battery terminal before starting any electrical work.
• Open the tailgate/boot and remove the trim panels to access the rear lamp mounting screws or clips.
• Remove the rear light cluster from the body to expose the lamp connector and harness routing.
• Unplug the old harness from the lamp and vehicle body connectors, taking note of routing and securing points (clips, grommets).
• Fit the new harness following the original routing, secure with clips and replace any grommets to prevent water ingress.
• Reconnect connectors, refit the lamp assembly and trim panels, then reconnect the battery and test all lamp functions (tail, brake, indicator, reverse, fog).

Installation Recommendations

• Always Disconnect The Battery Before Work To Avoid Short Circuits Or Damage.
• Use Dielectric Grease On Connectors In High-Moisture Areas To Reduce Corrosion.
• Inspect Connector Pins For Corrosion Or Bent Contacts And Clean Or Replace As Necessary.
• Ensure Proper Routing To Avoid Pinching Between Body Panels; Secure With Clips Or Cable Ties At Factory Attachment Points.
• After Installation, Verify All Light Functions From Both Sides And Check For Warning Messages On The Instrument Cluster.

Most Common Failure Causes

Rear lamp harnesses typically fail due to connector corrosion from moisture ingress, mechanical damage (impact or trunk loading), rodent chewing, or flex fatigue at fixed routing points. Poor repair history or improper sealing around grommets accelerates deterioration. Environmental exposure (road salt, humidity) increases the risk of oxidation and short circuits.

Durability And What To Expect

Service life depends on operating conditions; in dry, temperate environments a harness can last many years, while in coastal or salted-road regions signs of failure often appear earlier. Regular inspection during bodywork or lamp replacement helps detect problems before an electrical fault occurs.

Notes For Buyers

This harness is supplied as a replacement electrical lead for the left and right rear lamps on Citroën C4 five-door first series models. The item is offered without guaranteed functionality of bulbs, so bulbs and lamp units should be verified separately if required. Search by product codes (6350T8, 6351T8, 6534PC) for faster identification.