Valeo Alternator 12V 115A 439551

The Valeo Alternator 12V 115A, part number 439551, is a new rotating electrical unit supplied as an each item for vehicle charging system replacement. It is specified with a 12V system, 115A charge current and direct fastening, which are the key details to check before ordering.

This alternator uses a pad mount, 152mm mount centres and a 5 groove pulley with a 52mm outside diameter. It also has an internal regulator, clockwise rotation and a pin code of IR182, so the physical layout and connector arrangement should be matched carefully to the existing unit.

Valeo is listed as the unit make and brand, and the product is identified as a leading OE manufacturer and supplier for many euro vehicles. The listed weight is 6.14kg, which can be useful when comparing like-for-like replacement parts.

The application data provided includes Mercedes-Benz A-Class and B-Class references across multiple model years. Because alternators need to match both the electrical output and the mounting and pulley configuration, the part number and specifications should be confirmed against the vehicle before purchase.

Key Features

• 12V alternator with 115A charge current
• New unit, not remanufactured
• Internal regulator
• Pad mount with direct fastening
• 5 groove pulley, 52mm outside diameter
• Clockwise rotation

Specifications

• Brand: Valeo
• Part No.: 439551
• Product type: Alternator
• Voltage: 12V
• Charge current / power rating: 115A
• Mount type: Pad
• Mount centres A: 152mm
• Pulley section: 5 groove

Fitment references provided

• Mercedes-Benz A-Class
• Mercedes-Benz A-Class 2004 to 2012 references are listed
• Mercedes-Benz B-Class
• Mercedes-Benz B-Class 2005 reference is listed

Application and Buying Notes

When comparing this alternator to your original unit, start with the part number 439551, then check the 12V system requirement, 115A output, pad mount and 152mm mount centres. These are the main points that determine whether the alternator will physically suit the application and charge system layout.

The pulley details matter as much as the electrical rating. This unit has a 5 groove pulley with a 52mm outside diameter and clockwise rotation, so the belt profile and rotation direction must line up with the vehicle. If the pulley count, diameter or rotation differs from the existing alternator, it should not be treated as a direct match.

The internal regulator and IR182 pin code are also important identification points. The listing notes no connector for revolution counter, so the plug arrangement should be compared with the fitted part before ordering. These details are often where otherwise similar alternators differ.

Mercedes-Benz A-Class and B-Class application references are provided, but alternator fitment can vary within the same model range depending on engine or electrical setup. Confirm the vehicle against the part number, mount style, pulley section and connector details rather than relying on model name alone.

If you are replacing a failed alternator, compare the old unit side by side wherever possible. Matching the mounting face, connector arrangement, pulley specification and charge current is the safest way to avoid delay, return freight or installation issues. The listed 6.14kg weight can also help when checking whether the replacement is in the same class as the original unit.

Before supply, the safest approach is to confirm the original unit details against the listed part number, voltage, output rating, mounting arrangement, and pulley configuration. That checking process is standard practice in the parts trade because visually similar units can still differ in service-critical ways.

For workshop, fleet, and equipment applications, accurate identification of part number 439551 helps avoid unnecessary freight, additional labour, and vehicle or machine downtime. Where the application is not straightforward, the original unit, OEM reference, or workshop records should be used as the primary confirmation point.

Relevant published details for this unit include Type ALTERNATOR, Unit of Measure EACH, Warranty One Year, Pin Code IR182, Pulley Outside Diameter 52mm, Regulator Type Internal, Suits Unit Make Valeo, Alternator Mount Pad, Alternator Charge Current [A] 115, Connector / Clamp No Connector for Revolution Counter.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. 439551, Brand VALEO, Description Valeo Alternator 12V 115A, Mount Centres A 152mm, Power Rating (Amp) 115, Pulley Section 5 Groove, Rotation CW, Voltage 12.

Valeo Alternator 12V 115A. Part number 439551 should be checked first. Listed voltage is 12. Listed output rating is 115. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Pad. Regulator type is Internal. Pulley configuration is 5 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 439551, the normal identification sequence is part number, electrical rating, mounting arrangement, connector or terminal style, and pulley or drive details. Using those checkpoints helps confirm that the listed unit matches the service requirement rather than only looking similar.

For a alternator in workshop, fleet, trade, agricultural, or construction service, the listed voltage 12 and output 115 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Available application references include MERCEDES-BENZ A-CLASS, MERCEDES-BENZ A-CLASS 2004, MERCEDES-BENZ A-CLASS 2005, MERCEDES-BENZ A-CLASS 2006. Even with application listings, final confirmation should still be based on the exact unit being replaced and the service requirements of the vehicle or machine.

Compatibility note: Please confirm compatibility by matching part number 439551 and checking the vehicle application, 12V electrical system, 115A rating, pad mount, 152mm mount centres, 5 groove pulley and IR182 identification before ordering.

FAQ

What is the part number for this Valeo alternator?

The listed part number is 439551.

What voltage and output does it have?

It is a 12V alternator with a 115A charge current, also listed as 115 amp power rating.

Is this alternator new or remanufactured?

It is listed as new.

What pulley and rotation details are supplied?

It has a 5 groove pulley, 52mm pulley outside diameter and clockwise rotation.

What mounting style does it use?

The alternator has a pad mount, direct fastening and 152mm mount centres.

Which vehicles are referenced for fitment?

The provided fitment references include Mercedes-Benz A-Class and Mercedes-Benz B-Class applications, including A-Class model year references from 2004 to 2012 and a B-Class 2005 reference. Fitment should still be confirmed against the part number and the installed unit details.