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| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £4.99 | 1 to 2 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 5 to 7 working days |
| SERVICE | DELIVERY PRICE | DELIVERY TIME |
|---|---|---|
| Standard Delivery | £9.95 | 7 to 10 working days |
Product Number: 21906N
The WAI 21906N is a brand-new 12V 140A alternator. It is built to replace Bosch original-equipment units, including Bosch references 0 124 425 103 and 0 124 425 302. Designed as a direct IR/IF (internal regulator, internal fan) replacement, it delivers a robust 140-amp output at 12 volts — a specification suited to demanding electrical loads across automotive and light plant applications.
Constructed to match the outgoing Bosch unit dimensionally and electrically, the 21906N features clockwise rotation and an SC6 single-claw pulley, ensuring correct belt engagement and fitment to the original mounting points. The internal regulator and internal fan design simplifies installation by eliminating external regulator wiring and reducing under-bonnet clutter compared with older external-regulator alternators.
The Lester number for this unit is 21906, a widely used cross-reference identifier that helps confirm compatibility when searching by catalogue or trade system. Being supplied brand new rather than remanufactured means there are no worn brushes, degraded windings, or previously stressed bearings to consider — the unit arrives ready to fit straight from the box.
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PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specializing in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalog of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
| Type | Alternator |
|---|---|
| Voltage | 12V |
| Output | 140A |
| Rotation | CW |
| Design | IR/IF |
| Manufacturer | BOSCH |
| Pulley | SC6 |
| Lester | 21906 |
| Condition | Brand New |
| Engine Parts | Product Number | Product Name | Recommended Units | Product Price |
|---|
Exploring the WAI Starter Motor and Alternator at Partsformachines.com Introduction: In the Plant and Agriculture sector, a starter motor and alternator are parts that ensure a machine runs smoothly. At Partsformachines.com we have partnered with WAI, a global manufacturer of auto and plant machinery parts to off...
Standard Delivery: £4.99
Delivery Estimate: 1 to 2 working days
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| Technical Specification | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | 12384N | 13381N-7G | 13625N | 13922N | 13998N | 20008N | 20803N | 21346N | 21480N | 23344N | 23777N | 23914N | 11134N | 11234N | 11305N |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 |
| Output Current | 150 | 90 | 120 | 140 | 180 | 180 | 90 | 200 | 120 | 150 | 140 | 125 | 220 | ||
| Design | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | ||
| Manufacturer | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch | Bosch |
| Pulley | SC6 | S7 | S6 | SC6 | SC6 | SC6 | S6 | S6 | S7 | SC6 | SC6 | S6 | Groove Pulley | ||
| Rotation | CW | CW | CW | CCW | CW | CW | CW | CW | CW | CW | CW | CW | |||
A. The WAI 21906N is a direct replacement for Bosch original-equipment alternators carrying part numbers 0 124 425 103 and 0 124 425 302 — those are the two OE references on record for this unit. To confirm suitability for your specific vehicle or machine, search our cross-referenced catalogue by OEM number or ask Simon. Every OE cross-reference shown is backed by our Fit Guarantee.
A. The 21906N is a 12-volt alternator with a 140-amp output. It runs clockwise rotation, uses an SC6 single-claw pulley, and features an internal regulator with internal fan (IR/IF) design. The Lester catalogue number is 21906. It is supplied brand new.
A. IR/IF stands for Internal Regulator, Internal Fan. The internal regulator means no separate external regulator is needed — the voltage regulation circuitry is built into the alternator body. The internal fan cools the unit from within rather than relying on an external fan on the pulley end. Both features are part of the original Bosch design this unit is built to replicate, so the 21906N fits and wires identically to the unit it replaces.
A. It is brand new. The WAI 21906N is not a remanufactured or reconditioned unit — it is supplied new, so there are no previously used brushes, windings, or bearings.
A. Use the selection widget to match your make, model and engine, or search our cross-referenced catalogue by OEM number, machine model or equivalent part across brands. If your vehicle is not listed, ask Simon. Every fitment shown is backed by our Fit Guarantee.
A. Yes. Every vehicle and OE cross-reference shown for this part is checked against manufacturer data and backed by our Fit Guarantee. If it is not right, our Fit Guarantee or hassle-free returns have you covered.
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