- Shop with confidence: competitive prices, exclusive deals, and delivery perks.
- Need it quickly? We dispatch fast-moving parts daily. Check delivery options.
- Swap or return items within the standard return period with a simple process.
- Questions about fitment or orders? Our support team is ready to help.
Similar products
Customers also bought
Details
| Specification | Value |
|---|---|
| Brand | WAI |
| MPN | ib387 |
| Voltage [V] | 12 V |
OE/OEM numbers (14)
Search by this OE number to find compatible parts
- MERCEDES-BENZ—0021548106
- MERCEDES-BENZ—0021548206
- MERCEDES-BENZ—0021548506
- MERCEDES-BENZ—0021548706
- MERCEDES-BENZ—0021549206
- MERCEDES-BENZ—0022159106
- MERCEDES-BENZ—0031540606
- VAG—00A903803
- VAG—00A903803A
- SCANIA—4409983
- SCANIA—4466918
- CITROËN/PEUGEOT—576185
Where this part fits
Original-fit position for OE 00A903803. The red ring marks where this part installs on the vehicle.
About this product
When alternator regulator performance matters, the WAI IB387 delivers — built to the same dimensional and material standards as the original part it replaces. The part is built to the following specification: Voltage [V]: Zinc V. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. This part supersedes original equipment references: 0021548106, 0021548206, 0021548506, 0021548706 and 39 more. Matching these numbers confirms a like-for-like replacement with no loss of function. WAI is a recognised supplier of automotive replacement components to independent workshops and dealer networks across Europe. All parts are sourced from authorised distribution channels and carry full manufacturer traceability — you receive exactly the same component supplied to professional garages and dealer workshops. If fitment or specifications do not match your vehicle, our technical team can help identify the correct alternative — use the vehicle selector or contact us with your VIN for a guaranteed-fit recommendation. Replacing worn components on schedule preserves your vehicle's safety, reliability, and resale value — and aftermarket parts from established brands deliver OEM-equivalent performance at a fraction of the dealer price. Every part is dispatched from our UK warehouse with a 30-day money-back guarantee and free hassle-free returns.
Suitable cars
Vehicle matches are curated from manufacturer data
Confirmed fits based on manufacturer data.Equivalent products (30)
Show all 30 OE numbers
Alternator Regulator WAI IB387 — compatible car models
| Manufacturer article number (MPN) | IB387 |
|---|---|
| OE part numbers | 0021548106, 0021548206, 0021548506, 0021548706, 0021549206, 0022159106, 0031540606, 00A903803, 00A903803A, 4409983, 4466918, 576185, 95644488, 95644494 |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
WAI ib387 . Voltage [V]: 12 V
- 1x Alternator Regulator
Shipping, returns, warranty
Free UK delivery on orders over £99.00. Express and standard shipping available.
- Standard delivery: 2-5 business days
- Express delivery: 1-2 business days
- Free returns within 14 days
- All parts backed by manufacturer warranty
Warranty: 12-month manufacturer warranty on all parts. 14-day money-back guarantee if the part doesn't fit your vehicle.
Frequently Asked Questions
Is this Alternator Regulator compatible with my car?
Use the vehicle selector at the top of the page to check compatibility. Enter your car's make, model, and engine — we'll confirm whether this Alternator Regulator fits. All fitment data is verified through TecDoc.
What specifications does this WAI Alternator Regulator have?
This WAI Alternator Regulator has the following specifications: Voltage [V]: 12 V. Check the full specifications table above for complete details.
What OE part numbers does this Alternator Regulator replace?
This Alternator Regulator replaces OE part numbers: 0021548106, 0021548206, 0021548506, 0021548706, 0021549206, 0022159106, 0031540606, 00A903803 and 6 more. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Alternator Regulator cost?
This WAI Alternator Regulator is available for £12.99. Alternator Regulator prices vary depending on brand, specifications, and vehicle compatibility. WAI parts offer a balance of quality and value, backed by our 14-day money-back guarantee.
How do I know when to replace my Alternator Regulator?
Regular inspection of your Alternator Regulator is recommended as part of routine vehicle maintenance. Watch for changes in performance, unusual noises, or visual signs of wear. Consult your vehicle's owner manual for manufacturer-recommended replacement intervals specific to your make and model.
What tools do I need to replace a Alternator Regulator?
Tools required vary by vehicle make and model. Generally, a basic socket set, screwdrivers, and vehicle-specific tools may be needed. We recommend consulting a workshop manual for your specific vehicle, or having the Alternator Regulator fitted by a professional mechanic.
Can I use this part as a replacement for OE 0021548106?
Yes, this WAI Alternator Regulator is a direct replacement for OE part number 0021548106. It is manufactured to meet or exceed original equipment specifications, ensuring proper fitment and performance. All cross-reference data is verified through TecDoc.
Related categories
Common OE numbers for this part
Common original equipment numbers linked to stocked alternatives.
