Valeo Alternator 12V 120A 439420

This Valeo alternator is a 12V, 120A unit with part number 439420. It is a new alternator, supplied each, and it uses an internal regulator with a single pivoted lever fastening type.

The pulley is 51mm outside diameter with an 8 groove pulley section and clockwise rotation. It is listed with a quad leg alternator mount and no connector for revolution counter, so matching the mounting style and electrical connection setup is important before purchase.

Valeo is listed as the unit make, and the product is described as a leading OE manufacturer and supplier for many euro vehicles. The alternator weighs 6.48kg and carries a one year warranty.

Key Features

• New alternator, supplied each
• 12V, 120A output
• Internal regulator
• 51mm pulley outside diameter
• 8 groove pulley section
• Clockwise rotation

Specifications

• Brand: Valeo
• Part No.: 439420
• Voltage: 12
• Charge current: 120A
• Power rating: 120A
• Pulley outside diameter: 51mm
• Pulley section: 8 groove
• Rotation: CW

Known fitment references

• Mercedes-Benz C-Class
• Mercedes-Benz SLK
• Fitment references include C-Class applications from 2001 through 2007 and SLK applications from 2001 through 2003.
• Use the part number 439420 and the physical specifications to confirm the correct replacement before ordering.

Application and Buying Notes

The most reliable way to confirm this alternator is by matching part number 439420, then checking the 12V system, 120A charge current, 51mm pulley outside diameter, and 8 groove pulley section. These details need to line up with the vehicle’s original unit and belt arrangement.

The alternator uses an internal regulator and a quad leg mount with single pivoted lever fastening. If the original unit uses a different mounting layout or connector arrangement, the part may not suit even if the vehicle family appears similar.

Because this unit has no connector for revolution counter, check the plug and ancillary connections on the removed alternator before ordering. The listed fitment references point to Mercedes-Benz C-Class and SLK applications, but the exact match still needs to be confirmed against the vehicle’s original alternator.

Weight is listed at 6.48kg, which can be a useful comparison point when checking against the part already fitted. It is also a practical reminder to inspect brackets, belt condition, and mounting hardware during replacement rather than relying on appearance alone.

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 439420 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, Pulley Outside Diameter 51mm, Regulator Type Internal, Suits Unit Make Valeo, Alternator Mount Quad Leg, Alternator Charge Current [A] 120, Connector / Clamp No Connector for Revolution Counter.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. 439420, Brand VALEO, Description Valeo Alternator 12V 120A, Power Rating (Amp) 120, Pulley Section 8 Groove, Rotation CW, Voltage 12, New / Reman. New, Fastening Type Single pivoted lever.

Valeo Alternator 12V 120A. Part number 439420 should be checked first. Listed voltage is 12. Listed output rating is 120. These details form the core reference points used by parts interpreters when confirming the correct replacement.

Mount style is Quad Leg. Regulator type is Internal. Pulley configuration is 8 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 439420, 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 120 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm compatibility using part number 439420, the 12V 120A rating, 51mm pulley size, 8 groove pulley section, internal regulator, and the listed mounting and connection details before purchasing.

FAQ

What is the part number for this Valeo alternator?

The part number is 439420. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.

What voltage and output does this alternator have?

It is a 12V alternator with a 120A charge current and 120A power rating. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.

Is this alternator new or remanufactured?

It is listed as new. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.

What pulley details are listed?

The alternator has a 51mm pulley outside diameter and an 8 groove pulley section, with clockwise rotation. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.

What mounting and regulator style does it use?

It uses an internal regulator, a quad leg alternator mount, and a single pivoted lever fastening type. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.

Which vehicles are referenced in the fitment data?

The fitment references include Mercedes-Benz C-Class and Mercedes-Benz SLK applications, with C-Class listings from 2001 through 2007 and SLK listings from 2001 through 2003. Confirm the part number and physical specifications before ordering. For this listing, part number 439420 is the main reference point. Listed voltage is 12. Listed output rating is 120. Published fitment references include MERCEDES-BENZ C-CLASS, MERCEDES-BENZ C-CLASS 2001, MERCEDES-BENZ C-CLASS 2002. These details should still be checked against the original unit before ordering.