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WAI 20354N Alternator
| Brand | WAI 20354N |
|---|---|
| 12 | 12 |
| Fan Type | Internal |
| Rotation Direction | Clockwise (right) |
| Pulley Included | Yes |
| Family | Valeo |
| Pulley Groove Quantity | 6 |
| Pulley Belt Type | Serpentine |
| Regulator Type | Internal |
| Decoupled Or Clutch Pulley | Yes |
| Amperage Rating | 140 |
| Product line | New |
| Fits | Audi and Volkswagen · 28 vehicles |
New construction. 100% new alternator, not remanufactured.
140 amp output. Supports modern electrical loads with stable charging performance.
Valeo-style setup. Internal regulator, internal fan, and clutch pulley configuration.
Cross-references Four Seasons 20354, 06J-903-023-B and 06J-903-023-BX for the same application. See all 24.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Overview
This WAI alternator, part number 20354N, is a new 140 amp charging unit built for select Audi and Volkswagen applications with Valeo fitment. It uses an internal regulator, internal fan, and a decoupled clutch pulley to support stable electrical output in modern charging systems.
Compatible With Audi A3, S3, TT Quattro, and TTS Quattro applications, as well as Volkswagen Golf R, Atlas, and Tiguan applications listed below. Part number 20354N is a direct replacement option for vehicles that require the specified Valeo configuration.
Key Features
- New, not remanufactured alternator construction
- 140 amp amperage rating for modern electrical loads
- Internal regulator and internal fan design
- 6-groove serpentine pulley included
- Decoupled clutch pulley for Valeo-style applications
- Clockwise rotation, right-hand rotation direction
Detailed Description
WAI part number 20354N is engineered as a new replacement alternator for vehicles equipped with Valeo charging systems. The unit is built with proprietary components and manufacturing processes, and it is specified with a 140 amp output, internal regulation, and a serpentine pulley setup to match the listed applications. This alternator is relevant for Audi A3, Audi S3, and Volkswagen Golf R fitments where the OE configuration calls for a Valeo 140 amp unit.
The New product line focuses on fully new electrical components rather than remanufactured units, which makes it a straightforward choice when replacing a worn charging assembly. This part cross-references Four Seasons 20354 for the same application.
What It Is Used For
- Charging system failure caused by weak or inconsistent alternator output
- Battery warning lights related to charging performance
- Electrical accessory strain from insufficient amperage supply
- Noise or pulley-related issues in Valeo-style alternator assemblies
- Replacement of a failed alternator on listed Audi and Volkswagen models
Installation Notes and Tips
Verify the vehicle’s alternator configuration, amperage rating, pulley style, and regulator plug before installation. Fitment notes vary by model year and production date, including applications with 140 amp or 150 amp Valeo units. Confirm the listed notes for your exact Audi or Volkswagen application before ordering.
Quality Assurance
WAI states that this alternator is 100% new and manufactured with proprietary components and processes to support service life and performance.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2025 | Volkswagen | Tiguan | 2.0L | L4 | With 140 Amp Valeo Alternator, With 7:00 Regulator Plug; New |
| 2021 | Audi | Q3 | 2.0L | L4 | Valeo 140 Amp, To 11/23/2020 |
| 2020 | Audi | A3 | 2.0L | L4 | Valeo, 150 Amp, From 01/13/2020 |
| 2020 | Audi | S3 | — | — | Valeo, 150 Amp, From 01/13/2020 |
| 2019 | Audi | S3 | — | — | Valeo 140 Amp |
| 2019 | Volkswagen | Atlas | 2.0L | L4 | Valeo 140 Amp |
| 2019 | Volkswagen | Golf R | — | — | Valeo 140 Amp |
| 2018 | Audi | S3 | — | — | Valeo 140 Amp |
| 2018 | Audi | TT Quattro | — | — | Valeo 140 Amp |
| 2018 | Audi | TTS Quattro | — | — | Valeo 140 Amp |
| 2018 | Volkswagen | Atlas | 2.0L | L4 | Valeo 140 Amp |
| 2018 | Volkswagen | Golf R | — | — | Valeo 140 Amp |
| 2017 | Audi | A3 | 2.0L | L4 | Valeo 140 Amp, From 10/03/2016 |
| 2017 | Audi | A3 Quattro | — | — | Valeo 140 Amp, From 10/03/2016 |
| 2017 | Audi | S3 | — | — | Valeo 140 Amp, From 10/03/2016 |
| 2017 | Audi | TT Quattro | — | — | Valeo 140 Amp, From 10/03/2016 |
| 2017 | Audi | TTS Quattro | — | — | Valeo 140 Amp, From 10/03/2016 |
| 2017 | Volkswagen | Golf R | — | — | Valeo IR/IF, 140 Amp |
| 2016 | Audi | A3 | 1.8L | L4 | Valeo IR/IF, 140 Amp |
| 2016 | Audi | A3 Quattro | — | — | Valeo IR/IF, 140 Amp |
| 2016 | Audi | S3 | — | — | Valeo IR/IF, 140 Amp |
| 2016 | Audi | TT Quattro | — | — | Valeo IR/IF, 140 Amp |
| 2016 | Audi | TTS Quattro | — | — | Valeo IR/IF, 140 Amp |
| 2016 | Volkswagen | Golf R | — | — | Valeo IR/IF, 140 Amp |
| 2015 | Audi | A3 | 1.8L | L4 | Valeo IR/IF, 140 Amp |
| 2015 | Audi | A3 Quattro | — | — | Valeo IR/IF, 140 Amp |
| 2015 | Audi | S3 | — | — | Valeo IR/IF, 140 Amp |
| 2015 | Volkswagen | Golf R | — | — | Valeo IR/IF, 140 Amp |
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