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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: 20539N
The WAI 20539N is a brand-new 12V 120A alternator. It is built to the MARELLI IR/IF design specification, replacing original-equipment MARELLI units. Designed for fitment across Alfa Romeo, Fiat, and Lancia vehicles — including models such as the Fiat Bravo, Fiat Marea, Fiat Punto II, and Alfa Romeo S80 — this alternator covers 31 applications in total across the three makes.
Supplied brand new rather than remanufactured, the 20539N delivers 120 amperes of output at 12 volts with clockwise rotation and an internally regulated, internally excited (IR/IF) design. The IR/IF configuration means the voltage regulator is integrated within the alternator housing, simplifying installation and eliminating the need for an external regulator. With a Lester reference of 20539, cross-referencing to existing catalogues is straightforward.
This alternator suits European passenger car applications where the original MARELLI unit requires replacement due to wear or failure. The clockwise rotation and IR/IF design must match the vehicle's original specification before fitting; consult the vehicle's service documentation or use the fitment selection widget to confirm suitability for your exact make, model, and engine variant.
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| Type | Alternator |
|---|---|
| Voltage | 12V |
| Output | 120A |
| Rotation | CW |
| Design | IR/IF |
| Manufacturer | MARELLI |
| Lester | 20539 |
| 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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| Technical Specification | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PRODUCT NUMBER | 14482N | 21610N | 23853N | 21173N | 22155N | 23791N | 8440N | A4033 | A4058 | A4072 | A4084 | A4085 | A4103 | A9012 | A9266S |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 24 |
| Output Current | 124 | 90 | 90 | 110 | 90 | 100 | 105 | 70 | 80 | 70 | 85 | 110 | 40 | ||
| Design | IR/IF | IR/IF | IR/IF | IR/IF | IR/IF | ||||||||||
| Manufacturer | Marelli | Electroprecizia | VISTEON | Marelli | Ford | Mando | Ford | ||||||||
| Pulley | COUPLER | S6 | S6 | SC7 | S6 | AP | AP | AP | AP | AP | AP | AP | |||
| Rotation | CW | CW | CW | ||||||||||||
A. Yes. The WAI 20539N directly replaces MARELLI original-equipment reference 63321859. That is the sole OE cross-reference published for this part. If you are matching by OE number, search our cross-referenced catalogue or ask Simon to confirm suitability for your vehicle.
A. This alternator fits Alfa Romeo, Fiat, and Lancia models — including the Fiat Bravo, Fiat Marea, Fiat Punto II, and Alfa Romeo S80 — covering 31 applications in total across the three makes. Use the selection widget to match your exact make, model, and engine variant, or search our catalogue by OEM number. Every fitment shown is backed by our Fit Guarantee.
A. The WAI 20539N delivers 12 volts and 120 amperes output with clockwise rotation and an IR/IF (internally regulated, internally excited) design.
A. It is supplied brand new — not remanufactured or reconditioned.
A. IR/IF stands for Internal Regulator / Internal Field. The voltage regulator is built into the alternator body, so no external regulator is required. Confirm that your vehicle's original unit uses the same IR/IF design before fitting.
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. 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.
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