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Delco Alternator

Your Professional Delco Alternator Supplier

Shanghai E-star Auto Co., Ltd. is an integrated enterprise specializing in the design, development, production, and sale of automotive components. The company's product range includes starters and alternators compatible with various engine manufacturing machinery, catering to renowned brands such as Komatsu, Hino, Cummins, Hitachi, Caterpillar, Toyota, Hyundai, Volvo, Deutz, Perkins, Yangma, Doosan, and Mitsubishi. By offering a comprehensive product portfolio, Yixing satisfies the diverse requirements of both domestic and international markets.

Advanced Equipment

Equipped with state-of-the-art production facilities and precision testing instruments, Yixing guarantees the superior quality of every product it manufactures.

 

Quality Control

From raw material selection to each stage of the production process, and finally to finished product testing, Yixing adheres to rigorous quality control standards to ensure compliance with the highest industry benchmarks.

Sales Market

Yixing's products not only secure a significant market share domestically but are also exported to multiple regions worldwide, including North America, South Africa, Southeast Asia, Europe, and the Middle East.

ODM/OEM Services

Yixing offers both OEM and ODM services, enabling customization of materials, styles, and special requirements. Minimum order quantities can be discussed and tailored to meet specific client needs.

 

 
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Types of Delco Alternator

Internal Fan Alternator

The internal fan alternator has a cooling fan inside the case. It is used to cool the alternator by moving air. The internal fan alternator is popular because it is more compact and has a higher output.

External Fan Alternator

The external fan alternator has a cooling fan on the outside. It is more effective at cooling but takes up more space. The external fan alternator is mainly used in high-performance applications where a lot of electrical power is required.

High-output Alternator

The high-output alternator is designed to produce a lot of current. It is used in vehicles with many electrical accessories, such as sound systems, lights, and winches. The high-output alternator ensures enough power for all electrical needs.

 

Advantages of Delco Alternator

 
 
01
 

Alternators that Last Longer

Delco has a high-output alternator design that eliminates the use of brushes inside their alternators. Since brushes are the source for much of the wear, and therefore often the reason for failure in a traditional alternator, the brushless design contributes to a much longer life. As a result, your fleet will require less maintenance, the vehicles will suffer less down time, and you’ll spend less on keeping the vehicles up and running.

 
02
 

High-Output, High-Efficiency

Delco’s high-output alternators feature Remote Sense technology, which enables them to detect the actual charge in the battery and increase or decrease output as needed. As a result, they can charge the battery up to twice as fast as other alternators. For your fleet, this means fewer and less severe voltage drops, faster recovery, and fewer charging problems.

 
03
 

Improved Fuel Efficiency

Anything that runs off a vehicle’s engine will impact fuel consumption, as it is yet another part or system of parts for the engine to drive. Therefore, anything that can reduce the load your alternator puts on the engine will result in improved fuel efficiency. The superior features offered by Delco alternators — such as their brushless design, with fewer moving parts, and their high-efficiency, high-output design with faster charging time — result in less work for the engine, and ultimately less fuel required to operate the vehicle.

delco 28si

 

 
Precautions for Using Delco Alternator
 
01/

Keep It Clean: Clean the alternator regularly, especially the vents and cooling fins. This prevents dust and dirt buildup, which can affect the cooling performance.

02/

Check The Belt: The alternator is driven by a belt. Check the belt regularly to ensure it is properly tensioned and in good condition. A loose or damaged belt can affect the alternator's performance.

03/

Inspect Electrical Connections: Check all electrical connections to and from the alternator. Ensure they are tight and free from corrosion. Loose or corroded connections can lead to voltage drops and affect the charging efficiency.

04/

Monitor Performance: Use a multimeter to periodically check the alternator's output voltage. It should be between 13.5V and 14.5V when the engine is running. If the output voltage is low or unstable, have the alternator checked.

05/

Replace Worn Bearings: Bearings can wear out over time, leading to noise or vibration. Replace the bearings promptly to prevent further damage to the alternator.

06/

Check The Regulator: The regulator controls the alternator's output voltage. If the voltage is too high or too low, have the regulator checked and replaced if necessary.

07/

Inspect The Diodes: The diodes in the alternator can fail and cause charging problems. Have the diodes tested and replaced if faulty.

08/

Have Professional Maintenance: For major repairs or if unsure about any aspect of alternator maintenance, consult a qualified mechanic or alternator specialist.

 

What are the characteristics of Delco alternator?

 

 

Delco Remy Alternator – Key Characteristics

1.Heavy‑duty & brushless design: Most modern models (36SI/38SI/40SI/55SI) are brushless, fewer moving parts, longer life, less maintenance.

2.High efficiency & fuel savings: Up to 72–80% efficiency, reduces engine load and fuel use.

3.Strong low‑RPM output: Good power at idle/low speed (e.g., 38SI: 121A idle / 215A rated).

4.Wide power range: 12V/24V, 105A–430A; 55SI up to 430A (12V) / 275A (24V).

5.Remote sense standard: Improves battery charging by compensating voltage drop.

6.Rugged & reliable: High temp rating (up to 130°C), sealed bearings, heavy‑duty housings.

7.Common series:

28SI: Compact, 12V/24V, 110–200A, for trucks/buses.

36SI: Brushless, up to 170A (12V), fleet standard.

38SI: High‑efficiency, 215A, for heavy‑duty trucks.

40SI: Top power, 240–320A, for high‑load fleets.

55SI: Extreme output, up to 430A, for mining/offshore.

productcate-1260-708

 

What core technical advantages does Delco alternator have over other brands ?

 

 

1. Brushless Design & Ultra-Long Durability

Most modern models (36SI/38SI/40SI/55SI) use brushless construction, eliminating wear-prone brushes and slip rings. This drastically cuts maintenance needs and extends service life, especially in heavy-duty and high-vibration environments.

2. Superior Low-RPM/Idle Output

They deliver class-leading power at low engine speeds (e.g., 38SI: ~120A at idle, up to 215A rated). This is critical for fleets, emergency vehicles, and equipment that operate with extended idle times, preventing battery drain.

3. High Efficiency & Fuel Savings

With efficiency ratings up to 72–80%, they reduce parasitic engine load. This directly translates to lower fuel consumption, a key benefit for long-haul trucks and high-mileage fleets.

4. Robust & Protected Construction

Built to handle harsh conditions: high-temperature rated (up to 130°C), sealed bearings, heavy-duty housings, and optional load-dump/voltage spike protection. This ensures reliability in construction, mining, and off-road environments.

5. Integrated Remote Sense Technology

Standard on many models, this feature compensates for voltage drop in long wiring runs. It ensures the battery receives the correct charging voltage, improving battery life and overall system stability.

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In what aspects does the durability advantage of Delco alternator manifest under heavy-load or high-temperature conditions?

 

 

1. High temperature resistance

It adopts heat-resistant insulation materials and optimized heat dissipation structure, can steadily work under ambient temperature up to 130°C, avoids coil aging and performance decline caused by persistent high heat.

2. Brushless structural design

Cancel wearable carbon brushes and slip rings, reduce friction loss and failure risks. No easy wear parts to damage under long-time heavy load, greatly prolong service lifespan.

3. Sealed protection configuration

Sealed bearings and enclosed shell block dust, moisture and impurities infiltration. Prevent internal component corrosion and short circuit even in severe working scenes.

4. Reinforced anti-vibration build

Thickened housing and fixed internal parts withstand intense vibration from heavy machinery. Maintain stable power output without loose wiring or component dislocation under continuous heavy load.

5. Overload resistance performance

Reasonable circuit layout and durable electronic modules bear instantaneous current impact. Hardly burn out when bearing sustained heavy electrical load, guarantee continuous normal operation.

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What are the structural differences between Delco's brushless and traditional brushed alternators?

 

1. Rotor part

Brushless type removes carbon brushes and slip rings; brushed design equips wearable brushes and conductive slip rings.

2. Wear components

Brushless has no easily worn consumable parts; brushed alternator needs regular brush replacement.

3. Internal structure

Brushless adopts contactless power supply structure; brushed relies on sliding contact for current transmission.

4. Operational stability

Brushless generates less friction heat and spark; brushed produces abrasion and electric sparks during running.

5. Maintenance demand

Brushless nearly maintenance-free; brushed requires frequent inspection and part replacement.

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What are the advantages of Delco Alteror in terms of reliability and service life?

 

 

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01/

Brushless Design (Heavy-Duty Lines)

Fewer moving parts: Eliminates brushes and 13+ wearable components, reducing mechanical wear and contamination-related failures.

Longer service life: 36SI/40SI brushless models often exceed 250,000 miles in fleet use, vs. 80,000–120,000 miles for typical brushed units.

Reduced downtime: No brush replacement; sealed design blocks dust, oil, and moisture.

02/

Premium Materials & Build Quality

High-grade copper windings: Lower resistance, less heat, and better durability than generic aluminum windings.

Sealed bearings & high-temp lubricants: Resist vibration and extreme underhood heat (up to 125°C / 257°F).

Robust rectifiers & voltage regulators: 100% tested; diodes rated 30% higher than standard for thermal stability.

OEM-grade housings: Precision-machined for consistent fit, pulley alignment, and vibration resistance.

03/

Rigorous Testing & Validation

100% functional testing: Every unit undergoes load, thermal cycling, and vibration tests before shipping.

Extreme environment validation: Tested in high heat, cold, humidity, and corrosive conditions (salt, dust).

OE engineering standards**: ACDelco OEM units match original GM factory specs exactly, ensuring compatibility and longevity.

04/

Proven Service Life & Warranty

Passenger vehicles: ACDelco OEM/gold units typically last 80,000–150,000 miles (7–10 years).

Heavy-duty (36SI/40SI) 3-year/350,000-mile warranty (new) or 2-year/250,000-mile(remanufactured).

Field reliability: Fleet data shows 30–50% longer life than budget aftermarket alternators.

05/

Resistance to Harsh Conditions

Thermal stability: High-temperature components prevent degradation in hot engine bays (common in GM LS platforms).

Contamination protection: Brushless and sealed designs avoid brush sticking from dirt/oil, a top failure mode for brushed alternators.

Vibration tolerance: Reinforced mounting and internal bracing withstand heavy-duty and off-road vibration.

Delco alternators deliver longer life, fewer failures, and lower maintenance costs via brushless innovation, premium materials, strict testing, and extreme-condition durability—making them ideal for both passenger and heavy-duty applications.

 

 

Application of Delco Alternator

 

 

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01/

Passenger Vehicles & Light-Duty Trucks

Cars, SUVs, pickup trucks (GM, Chevrolet, Cadillac, GMC, etc.)

Light commercial vans(delivery, cargo, shuttle)

Key models: 10SI/12SI/15SI (70–120A, 12V), OE-spec for GM fleets.

Benefits: Compact, high efficiency, fits tight engine bays; 80k–150k mile service life.

02/

Heavy-Duty On-Highway Trucks

Class 8 long-haul tractors (Freightliner, Kenworth, Peterbilt, Volvo)

Refuse, dump, and concrete mixer trucks

Key models: 36SI/38SI/40SI (160–320A, 12/24V), brushless, remote sense option.

Benefits: 3-year/unlimited-mile warranty; 250k+ mile life; high output at idle (critical for accessories).

03/

Buses & Coaches

Transit buses, school buses, tour coaches

Key models: 38SI (215A), 40SI (300A), 24V systems for large fleets.

Benefits: 75%+ rated output at idle; handles AC, lights, and passenger electronics; vibration-resistant.

04/

Construction & Off-Road Machinery

Excavators, loaders, bulldozers, cranes, haul trucks (Caterpillar, Komatsu, Volvo)

Key models: 22SI/28SI/36SI (12/24V, 85–170A), sealed for dust/moisture.

Benefits: Withstands mud, vibration, and 125°C heat; brushless models eliminate brush wear.

05/

Agricultural Equipment

Tractors, combines, harvesters, sprayers (John Deere, Case IH, New Holland)

Key models: 28SI (high-output brushed), 36SI (brushless, 12/24V).

Benefits: Runs 10+ hours daily; resists dust, fertilizer, and extreme temps; low-RPM performance.

06/

Industrial & Power Generation

Generator sets (gensets), stationary engines, forklifts, material handlers

Marine vessels (yachts, workboats, fishing boats; 12/24V, corrosion-resistant coatings)

Key models: 22SI/24SI (50–70A), 36SI (105–170A, 24V).

Benefits: Stable power for critical systems; long life in continuous-duty applications.

07/

Emergency & Specialty Vehicles

Fire trucks, ambulances, police cruisers, armored vehicles

Key models: High-output 38SI/40SI (215–300A) for lights, radios, and hydraulic tools.

Benefits: Reliable under extreme load; rapid battery charging via remote sense.

 

What are the main series models of Delco alternators, and how do they differ from one another?

 

 

Model

Type

Voltage

Current Range

Core Advantage

Main Application

10SI/12SI/15SI

Brushed

12V

70-120A

Compact structure, cost-effective

Passenger cars, light trucks, light vans

22SI/24SI/28SI

Brushed

12V/24V

50-170A

Good heat dissipation, low RPM performance

Construction machinery, agricultural equipment, industrial power unit, marine light vessel

36SI

Brushless

12V/24V

105-170A

Dust & moisture sealed, long service life

Heavy trucks, engineering vehicles

38SI

Brushless

12V

215A

High idle output, vibration resistance

Bus, coach, emergency vehicle

40SI

Brushless

12V/24V

250-320A

Peak power supply, remote sensing available

Long-haul truck, large coach, mining machinery

DN Series

Brushed

12V

40-65A

Classic old model

Retro & vintage GM vehicles

CS Series

Brushed

12V

130-144A

Mini size

Late-model light passenger vehicles

 

 

FAQ

 

Q:What advantages does the Delco alternator have in output capability under idle (low RPM) conditions?

A:It maintains high rated output at low RPM, steadily powers electric accessories and quickly charges batteries even when engines idle.

Q:What protective measures must be taken for the Delco alternator before performing welding work on the vehicle?

A:Disconnect battery terminals and unplug alternator connectors to avoid circuit damage.

Q:What are the possible causes if an abnormal noise is heard from a Delco alternator?

A:Belt looseness/wear, bearing damage, loose fixing parts or internal rotor friction.

Q:How to choose a suitable Delco alternator?

A:Select based on vehicle type, system voltage, power demand and working environment.

Q:How to maintain a Delco alternator?

A:Regularly check belt tension, clean dust, inspect wiring and bearings, keep stable operating voltage.

Q:What are Delco alternators primarily composed of?

A:Mainly consist of rotor, stator, rectifier, voltage regulator, bearing and housing.

Q:In which industries are Delco alternators applied?

A:Used in passenger vehicle, truck, bus, construction, agriculture, industrial, marine and emergency vehicle industries.

Q:What are the precautions for installing Delco alternators ?

A:Secure mounting firmly, align drive belt properly, connect wires correctly and avoid over-tightening bolts.

Q: What is the Delco alternator used for?

A: The Delco alternator is a crucial part of a car's electrical system. It generates electricity to power the vehicle's electrical components and recharge the battery as the car runs.

Q: What does a Delco alternator mean?

A: Delco alternators are just alternators made by the General Motors Division called Delco. But now, the name Delco has come to mean any alternator, especially the ones used in cars.

Q: What are the three main parts of the alternator?

A: The alternator has three primary components: a rotor, a stator, and a power transistor. These parts work together to create electricity and maintain the car's electrical system.

Q: How long does a Delco alternator last?

A: A Delco 12 volt alternator can last between 7 to 10 years. But this lifespan can vary depending on how well the alternator is maintained and the conditions it works in.

Q: Does tapping on alternator work?

A: Tapping an alternator with a hammer can temporarily get it working in some cases, but it's not a permanent fix and should be avoided. It might work if the brushes are worn or have carbon buildup, causing a temporary jiggle that allows the brushes to make contact. However, this is only a diagnostic step and the alternator needs to be rebuilt or replaced.

Q: How do I know what size alternator I need?

A: Determine the amp load of the vehicle.
Determine available space and proper mounting location for alternator.
Determine what style alternator you need.
Determine how you want to wire your alternator.

As one of the leading delco alternator manufacturers and suppliers in China, we warmly welcome you to wholesale cheap delco alternator from our factory. All custom made products are with high quality and competitive price.