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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: 8728N
The WAI 8728N is a brand-new 24V 45A alternator. It is built to the Delco 11SI IR/IF design, replacing Cummins original-equipment number 3972731 and Remy reference 19020209. It is a direct-fit replacement for applications that use the Delco 11SI internally regulated, internally excited architecture, offering workshop-ready reliability straight from the box.
The 11SI IR/IF design means the voltage regulator and field circuit are fully self-contained within the alternator housing — there are no external regulator connections to wire in, simplifying installation and reducing points of potential failure. Clockwise rotation (viewed from the drive end) matches the original Delco specification, so the unit installs without modification.
At 45 amps on a 24-volt system, the 8728N provides a continuous output suited to heavy-duty plant, agricultural, and commercial-engine applications that originally specified the Delco 11SI. Supplied brand new, it carries no rebuilt or remanufactured caveats.
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| Type | Alternator |
|---|---|
| Design | Delco 11SI IR/IF |
| Voltage | 24V |
| Output | 45A |
| Rotation | CW |
| 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 | 8600310 | 7127-12R | A1029 | A1029PR | A1039 | 7127-SEN | 7127-SEN-100A1G | 7127-SEN-2G | 7256N | 7850N | 7853N-140A | 8030N | 8073N | 8718N | 12168N-DR |
| Voltage | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 12 | 24 | 12 | 12 | 12 | |
| Output Current | 63 | 100 | 100 | 140 | 63 | 100 | 63 | 90 | 100 | 140 | 70 | 130 | 160 | 160 | |
| Design | IR/EF | 10SI Series IR/EF | 10SI Series IR/EF | IR/EF | 30SI/TR Series IR/IF | 27SI/200 Series IR/EF | 15SI IR/EF | 21SI Series IR/EF | 22SI Series IR/EF | 24SI Series HP IR/IF | CS130D IR/IF | ||||
| Manufacturer | Delco | Delco | Delco | Delco | Delco | Delco | Delco | Delco | Delco | Delco | Delco | ||||
| Pulley | V1 | AFP | AFP | AFP | Groove Pulley | Groove Pulley | Groove Pulley | Without Pulley | Without Pulley | Groove Pulley | Without Pulley | Without Pulley | Without Pulley | Groove Pulley | |
| Rotation | CW | CW | CW | CW | CW | Bi-directional | CW | CW | CW | CW | CW | ||||
A. The 8728N replaces two OE references: Cummins 3972731 and Remy 19020209. These are the only cross-references published for this part. If you are working from a different reference number, search our cross-referenced catalogue by OEM number or ask Simon to confirm suitability.
A. The 8728N cross-references Cummins OE number 3972731, so it is designed to replace that original Cummins unit. To confirm it matches your specific engine variant and build, search our catalogue by OEM number or ask Simon — every fitment shown is backed by our Fit Guarantee.
A. The 8728N operates on a 24-volt system and delivers 45 amps of continuous output. It follows the Delco 11SI IR/IF design — internally regulated and internally excited, with clockwise rotation viewed from the drive end. It is supplied brand new.
A. IR/IF stands for Internal Regulator / Internal Field. It means the voltage regulator and field excitation circuit are built inside the alternator itself, so no separate external regulator is needed. This matches the original Delco 11SI architecture and keeps installation straightforward.
A. The WAI 8728N is brand new — not rebuilt or remanufactured. It is supplied ready to fit without any exchange or surcharge requirements.
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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