Delco Remy 55SI 24V 250A Heavy Duty Alternator – OEM 61006080 / 8600581 / 8600635

Designed for Heavy-Duty Fleets, Distributors, and OEM Buyers

This 55SI 24V 250A heavy duty alternator is engineered to meet the demands of professional buyers operating in high-load, mission-critical environments.

• Wholesale distributors sourcing Delco Remy 55SI 24V 250A alternators who require consistent supply and accurate OEM part numbers (61006080, 8600581, 8600635).

• Fleet maintenance teams maintaining trucks, buses, and construction machinery, demanding brushless heavy-duty alternators with reliable 24V 250A output at competitive cost.

• Heavy-duty equipment repair workshops managing mining, industrial, and off-road vehicles, needing long pad mount (105mm) alternators for seamless installation.

• OEM project buyers specifying custom mounting, connectors, or voltage settings, or requiring private labeling for fleet or machinery projects.

• Tender and government procurement programs that require certified alternators with technical documentation for compliance and bulk orders.

Key Advantages of Delco Remy 55SI 24V 250A Heavy Duty Alternator

OE-Level Replacement Accuracy

Designed as a direct-fit replacement for Delco Remy 55SI alternators, this unit matches original long pad (105mm) mounting, electrical interfaces, and output specifications, ensuring smooth installation with no modification required.

High Output 24V / 250A Performance

Delivers stable high-current output to support demanding electrical loads such as engine cooling systems, lighting, telematics, battery charging systems, HVAC, and auxiliary equipment in heavy-duty trucks, buses, and industrial machinery.

Optimized Cooling for Continuous Duty

Engineered with an efficient air-cooled architecture, the alternator maintains controlled operating temperatures during prolonged operation, high-load cycles, and frequent idling, supporting long service life in commercial and industrial environments.

Heavy-Duty Internal Components

Built 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.

100% End-of-Line Performance Testing

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.

Technical Specifications of WB2453 / Delco Remy 55SI Alternator

Cross-Reference Compatibility for Delco Remy 55SI Applications

Applications of Equipment Using 55SI-Type Alternators 

Heavy-duty trucks

Construction machinery

Agricultural tractors and harvesters

Buses and transport vehicles

Mining and off-road machinery

Power generation auxiliary systems

Elecdurauto OE-Level Manufacturing for Heavy-Duty Water-Cooled Alternators

CNC Machining Center

Precision machining for water-cooled housings and end covers to ensure perfect fitment, stable structure, and OE-level heat dissipation.

Automatic Stator Winding Machine

Automated winding and inserting systems deliver consistent copper density, insulation stability, and long-life electrical performance.

Rotor Dynamic Balancing Machine

High-precision balancing ensures smooth rotation, reduced vibration, and reliable performance under high-RPM duty cycles.

Torque-Controlled Assembly Line

Semi-automatic stations with torque control & poka-yoke guarantee fastening accuracy and consistent assembly quality.

Alternator Performance Test Bench (100% Final Test)

Every alternator is tested for output current, voltage regulation, rectifier integrity, and electrical safety before packaging.

High-Temperature & Endurance Test Chamber

Thermal cycling and full-load endurance tests validate heat resistance and long-term durability in heavy-duty applications.

Quality Assurance & Testing (OE-Grade Replacement Standards)

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.

Why Distributors and OEM Buyers Choose Elecdurauto as Their Alternator Partner

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

OEM Project Case from Elecdurauto Water-Cooled Alternator Supplier for Global Heavy-Duty Brands

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.

Water-Cooled Alternator Assembly

Stator Coil Precision Winding

Finished Heavy-Duty Alternator

OEM Packaging & Inventory

Bulk Export-Ready Stock

Rotor & Fan Subassembly

High-Output Alternator Housing

Cooling-Enhanced Rear Cover

Elecdurauto Core Advantages for Replacement Alternators

1. Exclusive Products – Unique in Global Markets

Certain alternator models and assemblies are exclusively developed by Elecdurauto and unavailable from other factories.

2. Fast Response – Inquiries Answered Within 24 Hours

I ensure fast communication to support your purchasing schedule and project decisions.

3. Custom Tooling – Rapid New Product Development

I support OEM/ODM development, custom tooling, label customization, and new-model prototyping.

4. Pricing Advantage – Lowest Global Pricing for Many SKUs

New SKUs are launched at highly competitive prices, and many existing models remain the lowest-cost option worldwide.

Buyer Protection, Warranty, and Global Supply Support

• 18-month warranty

• Pre-shipment photos and videos

• Serial number tracking

• Replacement for QC-approved claims

• Support for third-party inspection (SGS, TUV, BV)

Frequently Asked Questions – Delco Remy 55SI 24V 250A Heavy Duty Alternator 

1. What vehicles and equipment are compatible with the Delco Remy 55SI 24V 250A alternator？

This alternator is compatible with heavy-duty trucks, buses, industrial, and construction machinery that require 24V 250A high-output alternators. It fits long pad (105mm) mounting configurations and is ideal for fleets and industrial equipment globally.

2. Can the 55SI alternator directly replace existing Delco Remy or 55SI units？

Yes, it is a direct-fit OE-level replacement compatible with OEM part numbers 61006080, 8600761, 8600581, 61009283, 8600635, 8600737. No modifications are needed for installation, making it suitable for B2B fleet maintenance and industrial repair workshops.

3. What is the maximum output and performance capability?

The unit provides a stable 24V 250A output, supporting high electrical loads including engine cooling systems, lighting, HVAC, telematics, battery charging, and auxiliary equipment.

4. Is this alternator suitable for continuous heavy-duty operation?

Yes. It is designed for continuous-duty cycles, with an air-cooled architecture that maintains optimal operating temperatures during prolonged operation, frequent idling, and high-load conditions, ensuring long service life.

5. What internal components ensure reliability and durability?

Built with high-purity copper windings, oversized rectifier assembly, sealed heavy-duty bearings, reinforced aluminum housing, and a dynamically balanced rotor, the alternator ensures reduced vibration and consistent output under harsh industrial conditions.

6. Does the alternator support global OEM or private labeling projects?

Yes. OEM buyers can request custom mounting, connector configurations, voltage settings, or private labeling. It is suitable for global fleet OEM projects requiring certified, high-reliability components.

7. How is quality and performance verified before shipment?

Each unit undergoes 100% end-of-line testing, including full-load output verification, voltage regulation accuracy, thermal stability, vibration resistance, and electrical performance validation, ensuring reliability for B2B buyers worldwide.

8. What are the key technical specifications for installation and compatibility?

• Voltage: 24V

• Output: 250A

• Mounting: Long Pad 105mm

• Regulator: Internal

• Rotation: Clockwise (viewed from pulley side)

• Ground: Negative

• Housing: High-strength aluminum alloy

These details guarantee precise fit and performance for heavy-duty fleet and industrial applications.

9. Are aftermarket alternatives or cross-reference options available?

Yes. Compatible aftermarket reference number 240-4170 and program code WB2453 are available. Cross-reference ensures flexibility for B2B distributors and fleet operators who need quick replacements.

10. How can I order and ensure timely delivery for large-scale procurement?

We support B2B bulk orders, distributors, and fleet operators globally. Standard lead times apply, and shipping can be coordinated from China, the US, or EU warehouses, depending on your region, ensuring reliable supply and inventory management.