Upgrade your fleet with the 40SI 12V heavy duty alternator, delivering reliable 300A–320A output for commercial trucks, buses, and heavy equipment. Designed with a J180 Long Hinge mount and compatible with OEM numbers 8600300, 8600634, 8600755, 8759, this alternator ensures seamless replacement and consistent performance for demanding applications. Perfect for distributors, fleet operators, and aftermarket suppliers seeking durable, high-output solutions.
8600634、8600755、8600300
Elecdurauto
China
IATF 16949 / ISO 9001 / CE / RoHS
OEM label and ODM customization accepted
1 pcs
7–15 Days
50,000 pcs / month
18 months
| Quantity: | |
|---|---|
Product Description
This 40SI high-output alternator is engineered to meet the real-world demands of commercial and industrial buyers operating in high-load environments.
Wholesale distributors seeking a reliable supply of 40SI 12V heavy duty alternators with consistent 300A–320A output and predictable inventory for commercial and industrial applications.
Fleet maintenance teams that demand OE-level reliability, easy replacement with J180 Long Hinge mount, and compatibility with OEM part numbers 8600300, 8600634, 8600755, 8759.
Heavy-duty machinery repair workshops managing trucks, buses, and construction or mining equipment that require robust alternators for continuous operation under high load.
OEM project buyers needing custom voltage settings, mounting, connectors, or private labeling for integration into commercial vehicle or industrial machinery projects.
Tender and government procurement programs seeking alternators with full certifications, documentation, and compliance records for heavy-duty fleets and infrastructure equipment.
Designed as a direct-fit replacement for Delco Remy 40SI alternators, this unit matches original J180 Long Hinge mounting, electrical interfaces, and performance specifications, ensuring smooth installation with no modifications and reliable operation in commercial fleets.
Delivers stable high-current output to support demanding electrical loads such as engine cooling fans, lighting systems, HVAC units, onboard electronics, telematics, battery charging systems, and auxiliary equipment in heavy-duty trucks, buses, and industrial machinery.
Engineered with an efficient air-cooled design, the alternator maintains controlled operating temperatures during prolonged operation, frequent idling, and high-load cycles, providing long-term reliability in commercial and industrial environments.
Constructed with high-purity copper windings, oversized rectifier assembly, sealed heavy-duty bearings, reinforced aluminum housing, and dynamically balanced rotor to ensure durability, reduced vibration, and consistent output under harsh operating conditions.
Each alternator undergoes full functional testing, including full-load output verification, voltage regulation accuracy, vibration resistance, thermal stability, and electrical performance validation, ensuring reliable operation before shipment.
| Specification | Details |
|---|---|
| Model | WB2449 / 40SI High-Output Alternator Replacement |
| Type | 40SI Heavy-Duty Alternator Replacement |
| Voltage | 12V |
| Output | 300A – 320A |
| Cooling System | Air-Cooled |
| Mounting | J180 Long Hinge |
| Regulator | Internal |
| Rotation | Clockwise (viewed from pulley side) |
| Output Terminal | B+ Stud |
| Ground Type | Negative Ground |
| Housing Material | High-strength aluminum alloy |
| Reference Numbers | 8600300 / 8600634 / 8600755 / 8759 |
| Application Environment | Heavy-duty trucks, buses, diesel engines, commercial vehicles |
| Duty Cycle | Continuous-duty, high electrical load operation |
| Brand / Reference Type | Part Number / Series |
|---|---|
| Delco Remy | 8600300 |
| Delco Remy | 8600634 |
| Delco Remy | 8600755 |
| Aftermarket Reference | 8759 |
| Aftermarket Reference | 8753 |
| Aftermarket / Program Code | WB2449 |
| OEM / Equivalent Series | 40SI Air-Cooled Alternator Series |
Precision machining for water-cooled housings and end covers to ensure perfect fitment, stable structure, and OE-level heat dissipation.
High-precision balancing ensures smooth rotation, reduced vibration, and reliable performance under high-RPM duty cycles.
Semi-automatic stations with torque control & poka-yoke guarantee fastening accuracy and consistent assembly quality.
Every alternator is tested for output current, voltage regulation, rectifier integrity, and electrical safety before packaging.
Thermal cycling and full-load endurance tests validate heat resistance and long-term durability in heavy-duty applications.
Every alternator undergoes:
100% output performance test
Voltage regulation test
High-temperature resistance test
Vibration and durability test
Rotor/stator electrical integrity testing
Noise & bearing inspection
Full load endurance test
All tests follow IATF 16949 quality-management requirements.
This model is one of the most widely used heavy-duty alternators in commercial fleets. Mechanics and distributors choose this Elecdurauto replacement because:
It is easier to source and more cost-effective than OEM units
Output performance meets or exceeds OE charging specifications
Installation is plug-and-play with matching connectors and mount
It withstands long idling hours, high temperatures, and vibration
Lower total cost of ownership for fleets and service centers
At Elecdurauto, I deliver more than just heavy-duty alternators—I provide full-cycle engineering and supply solutions built around each OEM customer's exact platform requirements. As a trusted global supplier specializing in water-cooled alternators for buses, construction machinery, mining vehicles, and high-load commercial platforms, I work closely with manufacturers to ensure every unit aligns with their electrical, thermal, and durability standards.
Certain alternator models and assemblies are exclusively developed by Elecdurauto and unavailable from other factories.
I ensure fast communication to support your purchasing schedule and project decisions.
I support OEM/ODM development, custom tooling, label customization, and new-model prototyping.
New SKUs are launched at highly competitive prices, and many existing models remain the lowest-cost option worldwide.
18-month warranty
Pre-shipment photos and videos
Serial number tracking
Replacement for QC-approved claims
Support for third-party inspection (SGS, TUV, BV)
Our 40SI heavy duty alternator is engineered for commercial trucks, buses, diesel engines, and heavy equipment, supporting high electrical demands in fleet, construction, and industrial applications. It is compatible with vehicles requiring 12V 300A–320A output.
Yes. This unit is a direct-fit replacement for Delco Remy 40SI models with J180 Long Hinge mount, matching bolt patterns, electrical interfaces, and performance, so no bracket or wiring modifications are needed.
Check your current OEM/reference numbers. This alternator cross-references with 8600300, 8600634, 8600755, 8759, and similar 40SI series parts. If your engine or vehicle spec matches one of these, it's a direct replacement.
With 300A–320A output at 12V, it reliably powers heavy electrical systems such as engine cooling fans, lighting, HVAC, telematics, and auxiliary electrical equipment found in commercial fleet vehicles.
Yes. The alternator is equipped with an internal regulator, ensuring stable voltage output and efficient battery charging throughout varied load conditions.
Absolutely. Its brushless, air‑cooled design and optimized cooling maintain operation during prolonged use, high‑load cycles, and frequent idling—typical in heavy‑duty commercial environments.
We provide installation guidelines, performance specs, and compatibility charts for fleet technicians and distributors. If you require certifications, testing reports, or OEM compliance documentation for procurement programs, contact our support team.
Each alternator is 100% tested for output performance, voltage regulation, thermal stability, and vibration resistance before shipment. We back this with a commercial‑grade warranty and post‑sale technical support.
Yes. Designed for global commercial applications, it meets performance expectations across varied operating environments (North America, Europe, Asia) and can be supplied with export documentation and freight solutions for international distributors.
Absolutely. We support OEM/ODM services, including custom labeling, packaging, and production configurations to meet distributor and OEM project requirements.
