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Details
| Specification | Value |
|---|---|
| Brand | ASTEMO-HITACHI |
| Voltage [V] | 14.5 V |
| Manufacturer Restriction | OE VALEO |
| Rated Voltage [V] | 14 V |
OE/OEM numbers (2)
Search by this OE number to find compatible parts
- SKODA—03C903803
- AUDI / SKODA / VAG / VW—059903803D
Where this part fits
Original-fit position for OE 059903803D. The red ring marks where this part installs on the vehicle.
About this product
When alternator regulator performance matters, the ASTEMO-HITACHI 2500730 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]: Nylon, Rubber V, Manufacturer Restriction: OE VALEO, Rated Voltage [V]: Nylon V. Each dimension is checked against the OEM reference to ensure the component seats and functions correctly first time. Compatible with AUDI, BMW, CITROËN, FIAT and 6 other makes vehicles; use the vehicle selector above to confirm exact fitment for your make, model, and engine variant. Fitment data is sourced from TecDoc, the authoritative European parts catalogue. This part supersedes original equipment references: 03C903803, 059903803D, 2542323, 2542324 and 13 more. Matching these numbers confirms a like-for-like replacement with no loss of function. ASTEMO-HITACHI 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
Equivalent products (15)
Alternator Regulator ASTEMO-HITACHI 2500730 — compatible car models
| Car models | AUDI: A4 B5 (8D2), A4 B5 Avant (8D5), A4 B6 (8E2), A4 B6 Avant (8E5), A4 B6 Convertible (8H7), A6 C5 (4B2, 4B4), A6 C5 Avant (4B5, 4B6), A8 D2 (4D2, 4D8), A8 D3 (4E2, 4E8), ALLROAD C5 (4BH); BMW: 5 (E34); CITROËN: BERLINGO / BERLINGO FIRST MPV (MF, GJK, GFK), C5 I Break (DE), EVASION MPV (22, U6), JUMPER I Bus (230P), JUMPY I (U6U), JUMPY I Van (BS, BT, BY, BZ), SAXO (S0, S1), XANTIA Break (X1, X2), XM Break (Y4), XSARA Break (N2) (+3 more); FIAT: DUCATO Bus (230), DUCATO Platform/Chassis (230), DUCATO Van (230), ULYSSE (220); MERCEDES-BENZ: 124 Saloon (W124), 124 T-Model (S124) |
|---|---|
| Engines | 1.9 TDI quattro; 1.8 T; 2.4; 1.9 TDI; 2.5 TDI; 3.0 TDI quattro; 2.5 TDI quattro; 518 i; 1.9 D (MFDJY); 3.0 V6 (DEXFXC, DEXFXF); 2.0 Turbo C.T.; 2.5 D 4x4; 1.9 D; 1.9 TD; 1.1 X, SX (+8 more) |
| Year of manufacture | 1984-2010 |
| Manufacturer article number (MPN) | 2500730 |
| OE part numbers | 03C903803, 059903803D |
Compatibility check
Loading vehicle data…
Please wait while we load vehicle compatibility information.Description and what's included
ASTEMO-HITACHI 2500730 . Manufacturer Restriction: OE VALEO. Rated Voltage [V]: 14 V. Voltage [V]: 14,5 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?
This Alternator Regulator fits AUDI, BMW, CITROËN, FIAT, MERCEDES-BENZ and 5 more vehicles. Use the vehicle selector at the top of the page to check exact compatibility — enter your car's make, model, and engine for a confirmed fitment match. All fitment data is verified through TecDoc.
What specifications does this ASTEMO-HITACHI Alternator Regulator have?
This ASTEMO-HITACHI Alternator Regulator has the following specifications: Voltage [V]: 14,5 V; Manufacturer Restriction: OE VALEO; Rated Voltage [V]: 14 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: 03C903803, 059903803D. Cross-reference these numbers with your vehicle's original part number to confirm compatibility.
How much does a Alternator Regulator cost?
This ASTEMO-HITACHI Alternator Regulator is available for £43.99. Alternator Regulator prices vary depending on brand, specifications, and vehicle compatibility. ASTEMO-HITACHI 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 03C903803?
Yes, this ASTEMO-HITACHI Alternator Regulator is a direct replacement for OE part number 03C903803. 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.
