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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: 20803N
The WAI 20803N is a brand-new 12V 180A alternator. It is built to replace BOSCH original-equipment units, specifically replacing BOSCH references 0 125 811 089 and 0 125 811 090. Designed to BOSCH IR/IF (internal regulator/internal fan) specification, it delivers reliable high-output charging for demanding plant and agricultural applications where sustained electrical load is a constant requirement.
Constructed to match the original BOSCH design envelope, the 20803N features clockwise rotation and an SC6 single-claw pulley, ensuring direct mechanical compatibility with the original drive arrangement. The IR/IF configuration keeps the voltage regulator and cooling fan fully internal, eliminating the need for external regulator wiring and simplifying installation. At 180A output this is a high-capacity unit suited to machines carrying heavy ancillary electrical loads.
The Lester cross-reference number for this alternator is 20803, which can be used to verify fitment against workshop databases and cross-reference catalogues. Because vehicle and machine fitment data is not published for this listing, buyers are encouraged to confirm suitability by OE number before ordering.
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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 | 180A |
| Rotation | CW |
| Design | IR/IF |
| Manufacturer | BOSCH |
| Pulley | SC6 |
| Lester | 20803 |
| 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...
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Delivery Estimate: 1 to 2 working days
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| Technical Specification | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | 12384N | 13381N-7G | 13625N | 13922N | 13998N | 20008N | 21346N | 21480N | 21906N | 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 | 90 | 140 | 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 | S6 | SC6 | S6 | S7 | SC6 | SC6 | S6 | Groove Pulley | ||
| Rotation | CW | CW | CW | CCW | CW | CW | CW | CW | CW | CW | CW | CW | |||
A. The WAI 20803N is a direct replacement for BOSCH original-equipment alternators referenced as 0 125 811 089 and 0 125 811 090. These are the two OE cross-references published for this part. To confirm suitability for your machine, search our cross-referenced catalogue by OEM number or ask Simon.
A. The Lester catalogue number for this unit is 20803. Lester numbers are widely used in workshop databases and parts catalogues to cross-reference alternators across brands and applications. Enter 20803 in our catalogue search or ask Simon to verify whether this alternator is listed against your specific machine or vehicle.
A. The 20803N is a 12V alternator with a rated output of 180A. It uses an IR/IF (internal regulator/internal fan) design, runs clockwise rotation, and is fitted with an SC6 single-claw pulley. It is supplied brand new and is built to BOSCH specification.
A. IR/IF stands for Internal Regulator/Internal Fan. The voltage regulator is housed inside the alternator body rather than mounted externally, which simplifies wiring during installation. The cooling fan is also internal, meaning no external fan assembly is required. This matches the original BOSCH design this unit is built to replace.
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.
A. Yes — ask Simon, or WhatsApp our team on 07754 288583 with any questions about specifications, suitability, or compatibility.
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