Mahle Electronic Voltage Regulator MGX503 for Alternator Ref. 37911125122
Genuine Mahle electronic voltage regulator, part number 37911125122 (cross-references MGX 503, MGX503). Engineered to maintain steady alternator charging voltage, safeguarding the vehicle electrical system and battery against overvoltage and power surges. High-precision OE-quality replacement component designed for Mahle / Iskra alternators across agricultural machinery and tractors.
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Description
Genuine Mahle electronic voltage regulator, part number 37911125122 (cross-references MGX 503, MGX503). Engineered to maintain steady alternator charging voltage, safeguarding the vehicle electrical system and battery against overvoltage and power surges. High-precision OE-quality replacement component designed for Mahle / Iskra alternators across agricultural machinery and tractors.
Key features
Solid-State Electronic RegulationMaintains a tight 14 V charging set-point, safeguarding electrical circuits and tractor ECUs against transient inductive surges and thermal drift.
Integrated Brush Holder UnitFactory-assembled with premium copper-graphite brushes and pre-calibrated springs to provide steady contact on the rotor slip rings and minimize radio frequency interference.
Heavy-Duty Agricultural Dust & Moisture SealingFully potted electronic circuitry in high-grade dielectric resin to withstand airborne dust, harvest chaff, moisture, and engine compartment vibration.
Thermal Compensation & Overload ProtectionBuilt-in active thermal management dynamically trims charging rates as under-hood temperatures rise, prolonging battery life.
Direct OEM Fitment for MAHLE / Iskra AlternatorsDirect drop-in replacement for MGX503 and MGX 503 part numbers, mounting directly onto the rear end-shield without harness alterations.
Compatibility
| Application Category | Compatible Alternators & Machine Series |
| Compatible Alternators | MAHLE / Iskra / Letrika 14V alternators rated at 45A55Aand 65A (including 379IA0499 / MG 604 / 11.201.499 and derivatives) |
| Antonio Carraro Tractors | Series 30040050060070090009800 compactorchardand crawler tractors equipped with MAHLE charging systems |
| Case IH Tractors | B-Familie (644744844856 XL)C-Familie (95595610551056 XL)CS and Compact series with matching MAHLE/Iskra units |
| Deutz-Fahr Tractors | Series D 06D 07DXDX 3DX 4DX 6AgroPrimaAgroStarAgroXtra fitted with MAHLE / Iskra alternators |
| John Deere Equipment | Series 20304050 tractors and Series 900 combine harvesters configured with compatible charging generators |
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Specifications
| Commercial Part Number | 37911125122 |
|---|---|
| Manufacturer / Quality Brand | MAHLE (Iskra / Letrika) |
| OEM / Reference Codes | 37911125122, MGX503, MGX 503 |
| Component Classification | Electronic voltage regulator with integrated brush holder |
| Nominal System Voltage | 14 V (for 12 V vehicle battery electrical systems) |
| Voltage Set-Point | 14.2 V – 14.5 V |
| Brush Assembly | Pre-installed low-wear copper-graphite brushes with calibrated springs |
| Mounting Configuration | Internal/rear-mounted on alternator slip-ring end-frame via direct screw bosses |
| Primary Function | Voltage regulation and field excitation for MAHLE/Iskra agricultural alternators |
Compatible parts and accessories 5
Parts and accessories that go with this product
Compatible
Mahle Carbon Brush Kit for Alternators Ref. 37916770134 OEM MGX1674S JX322
Ref. 37916770134€14.50
Compatible
Mahle Alternator 14V 65A for Deutz-Fahr Case IH John Deere Antonio Carraro Ref. 379IA0499
Ref. 379IA0499€179.00
Compatible
Mahle Alternator Pulley SPZ V-Belt 68 mm Part 37916906308 Ref. MGX674KIT
Ref. 37916906308€27.50
Compatible
Mahle Electronic Voltage Regulator MX14 for Alternator Part 37911125177 Ref. 139515
Ref. 37911125177
Compatible
Mahle Alternator Cooling Fan Flywheel Clockwise Rotation Ref. 37915900726
Ref. 37915900726From the same category: A. Carraro Alternators
Other items from the same family
Same category: not always compatible, check the model in the description.
Mahle Voltage Regulator for Alternators Ref. 37911125198 OEM MGX1801 130676
Ref. 37911125198€89.00
Mahle Carbon Brush Kit for Alternators Ref. 37916770134 OEM MGX1674S JX322
Ref. 37916770134€14.50
Mahle Alternator Pulley SPZ Profile Ref. 37916906120 OEM MGX63KIT
Ref. 37916906120€33.50
Alternator 14V 65A Pulley 73 mm for Deutz-Fahr Case IH John Deere Ref. 3760010056
Ref. 3760010056€125.00
Mahle Alternator Pulley SPZ V-Belt 68 mm Part 37916906308 Ref. MGX674KIT
Ref. 37916906308€27.50
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Shipping and returns
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Mahle Electronic Voltage Regulator MGX503 for Alternator Ref. 37911125122Price€59.00