Genuine Products Alternator 12V 140A Bosch 04L903021GX

This Genuine Products alternator is a new 12V, 140A unit for Bosch applications, identified by part number 04L903021GX. It is supplied as an alternator assembly for rotating electrical systems and is sold as each, with a stated one year warranty.

The unit features an internal regulator, a 6 groove pulley, a quad leg alternator mount, and an M8x1.25 pivot hole diameter listed at 8.5. Other recorded mounting details include 60mm inside mounting legs and 128mm mount centre to centre, so matching the physical layout is important before ordering.

Because this is a Genuine Products alternator described as a leading OE manufacturer and supplier for many euro vehicles, it is positioned as a replacement for customers wanting a new 12V Bosch-suited alternator rather than a remanufactured unit. The recorded power rating is 140 amp, and the unit weight is 6.62kg.

Key Features

• New alternator, not remanufactured
• 12V, 140A output
• Internal regulator
• 6 groove pulley
• Quad leg alternator mount
• Bosch unit suitment listed

Specifications

• Part number: 04L903021GX
• Brand: Genuine Products
• Type: Alternator
• Voltage: 12V
• Power rating: 140 amp
• Pulley outside diameter: 52mm
• Pulley section: 6 groove
• Regulator type: Internal

Verified fitment notes

• Volkswagen Golf Alltrack
• Volkswagen Golf Alltrack 2017
• Volkswagen Golf Alltrack 2018

Application and Buying Notes

Before ordering, compare the part number 04L903021GX and the mounting details against the alternator being removed from the vehicle. The key physical checks here are the Bosch suitment, internal regulator, quad leg mount, 6 groove pulley, 52mm pulley outside diameter, and the listed 128mm mount centre to centre.

The recorded pivot hole diameter of M8x1.25 / 8.5 and inside mounting legs of 60mm are the kind of measurements that help confirm whether the alternator will physically match the bracket and fixing arrangement. If the old unit differs in pulley section, mounting leg spacing, or regulator type, it should be matched carefully before fitting.

This alternator is listed at 12V and 140A, so it should be compared to the electrical requirements of the vehicle and the original unit being replaced. Matching output and design details matters on modern charging systems, especially where Bosch components and euro vehicle applications are involved.

The one year warranty applies to the part as supplied, but warranty cover is not the same as confirming fitment. A successful purchase still depends on checking the part number, mount style, and pulley specification against the vehicle application and the removed alternator.

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 04L903021GX 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, Pivot Hole Diameter M8x1.25 / 8.5, Pulley Outside Diameter 52mm, Regulator Type Internal, Voltage 12, Item Type Alternator, New / Reman. New.

Additional published details for cross-checking include Product Group 2 ALTERNATORS, Part No. 04L903021GX, Brand GENUINE PRODUCTS, Description Genuine Alternator 12V 140A Bosch, Inside Mounting Legs 60mm, Power Rating (Amp) 140, Pulley Section 6 Groove, Suits Unit Make Bosch, Alternator Mount Quad Leg, Mount Cnt to Cnt 128mm.

Genuine Alternator 12V 140A Bosch. Part number 04L903021GX should be checked first. Listed voltage is 12. Listed output rating is 140. 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 6 Groove. Those physical and electrical details should line up with the original unit before the replacement is approved for fitment.

For part number 04L903021GX, 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 140 should be checked carefully. Incorrect selection can affect installation time, return freight, and equipment availability.

Compatibility note: Confirm fitment by matching part number 04L903021GX, Bosch suitment, and all mounting and pulley details with the existing unit before purchase. If the vehicle is a Volkswagen Golf Alltrack, the listed application notes should still be checked against the exact build and the alternator currently fitted.

FAQ

Is this alternator new or remanufactured?

This alternator is listed as new. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.

What is the electrical output?

The alternator is listed at 12V and 140A. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.

What type of regulator does it use?

It has an internal regulator. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.

What pulley setup is listed?

The listed pulley is a 6 groove design with a 52mm outside diameter. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.

What part number should I check before ordering?

The recorded part number is 04L903021GX. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.

Which vehicles are shown in the fitment notes?

The fitment notes list Volkswagen Golf Alltrack, including 2017 and 2018 applications. For this listing, part number 04L903021GX is the main reference point. Listed voltage is 12. Listed output rating is 140. Published fitment references include VOLKSWAGEN GOLF ALLTRACK, VOLKSWAGEN GOLF ALLTRACK 2017, VOLKSWAGEN GOLF ALLTRACK 2018. These details should still be checked against the original unit before ordering.