Product Overview

This VALEO CL15 150A alternator is a direct-fit charging unit commonly used on a range of Citroën and Peugeot models. With a 150 amp output and a freewheel (one-way) pulley, the unit supplies stable charging current for modern electrical systems while reducing belt shock during deceleration. The alternator is suitable for professional workshops and experienced DIY mechanics who need a reliable replacement part identified by common OEM numbers.

Technical Information

Manufacturer: Valeo

Model: CL15 Alternator

Product Codes: 9646321780, 5702E3, 5705AS

Other Numbers: 5705EY, 5705NH, 1638095180, 150A

Compatibility

• Citroën C2
• Citroën C3
• Citroën C3 Picasso
• Citroën C3 Pluriel
• Citroën C4
• Citroën C4 II
• Citroën C4 Picasso
• Citroën C5
• Citroën C5 (X7)
• Citroën C8
• Peugeot 307
• Peugeot 407
• Peugeot 807

How It Works And What It Does

The alternator converts mechanical energy from the engine into electrical energy to charge the battery and power vehicle electrical systems. A 150 A rating ensures sufficient capacity for vehicles with multiple electrical loads. The freewheel pulley (one-way pulley) decouples the alternator rotor from belt shock during rapid deceleration, which helps protect the belt drive and smooth engine braking effects.

Common Symptoms Of Failure

• Battery warning light on the dashboard or irregular charging voltage.
• Frequent battery discharge or inability to hold charge.
• Unusual noises from the alternator area (bearing rumble, grinding).
• Electrical accessories dimming or intermittent failures at idle.

Why The Part Most Often Fails

Typical causes of alternator failure include bearing wear due to age or contamination, voltage regulator malfunction, diode bridge failure, brush wear, overheating from poor ventilation, and belt or pulley issues. Vehicles operating in harsh conditions (frequent short trips, heavy electrical loads, or contaminated engine bays) tend to accelerate wear. The freewheel pulley can also fail internally, producing noise or reducing charging efficiency.

Replacement Frequency

Alternator lifespan depends on driving style and environment. Under normal conditions many alternators last well over 100,000 km, but heavy urban use, frequent short journeys, or exposure to oil/water contamination can shorten service life. Inspect the charging system during regular maintenance intervals and replace the alternator when charging performance or mechanical integrity is compromised.

Installation

1. Disconnect the negative battery terminal before any work.
2. Remove the drive belt (note belt routing) and any obstructing components.
3. Disconnect electrical connectors and the main charging cable from the alternator.
4. Remove mounting bolts and withdraw the alternator from its bracket.
5. Fit the replacement alternator, tighten mounting bolts to the manufacturer’s specification, reconnect electrical connections and refit the drive belt with correct tension.
6. Reconnect the battery and verify charging voltage at idle and under load (typically around 13.8–14.6 V with engine running).

Installation Recommendations

• Always Disconnect Battery Before Work To Avoid Short Circuits Or Damage.
• Inspect And Replace The Serpentine Belt And Tensioner If Showcasing Wear.
• Check Ground Connections, Battery Condition, And Charging Voltage After Installation.
• Ensure Proper Pulley Alignment To Prevent Premature Belt Wear.
• Use Correct Tools And Torque Values Where Specified By The Vehicle Manufacturer.

Notes For Professionals And DIYers

This alternator is aimed at workshops and experienced DIYers who can identify parts by OEM numbers. When replacing the unit, verify the fitment against the vehicle’s existing alternator mounting and connector layout. If uncertain about electrical diagnostics or belt systems, consult workshop documentation or a qualified technician.