Quick Facts

  • Manufacturer: Delco Remy
  • Product Family: 28SI
  • Product Type: Heavy-duty brush-type alternator
  • Electrical Systems: 12-volt and 24-volt configurations
  • Rated Output: 160, 180, or 200 amps at 12 volts; 110 amps at 24 volts
  • Maximum Speed: 10,000 RPM continuous; 12,000 RPM intermittent
  • Rotation: Clockwise
  • Mounting Options: J180 short hinge, J180 long hinge, or pad mount
  • Ground Configuration: Negative ground
  • Remote Sense: Standard
  • Primary Applications: Heavy-duty trucks, buses, vocational vehicles, construction equipment, and other high-electrical-load commercial vehicles
  • Production Status: Available in application-specific new and replacement configurations

Overview

The Delco Remy 28SI is a heavy-duty brush-type alternator designed for commercial vehicles with substantial and frequently changing electrical loads. It converts mechanical energy supplied by the engine into regulated electrical power for vehicle accessories while replenishing the batteries.

The 28SI is offered in 12-volt versions rated at 160, 180, or 200 amps and a 24-volt version rated at 110 amps. Its available J180 short-hinge, J180 long-hinge, and pad-mount configurations allow it to support numerous commercial-truck, bus, vocational, and equipment applications.

Dual internal fans help move cooling air through the alternator. Standard Remote Sense capability allows the voltage regulator to compensate for voltage losses between the alternator and the vehicle’s principal electrical distribution point when the feature is correctly connected.

Key Characteristics

  • Heavy-duty brush-type alternator
  • Available for 12-volt and 24-volt electrical systems
  • Output ratings reaching 200 amps in 12-volt configurations
  • Dual internal cooling fans
  • Standard Remote Sense capability
  • J180 short-hinge, J180 long-hinge, and pad-mount options
  • High-temperature operating design
  • Clockwise rotation
  • Negative-ground electrical configuration
  • Application-specific pulley and terminal arrangements
  • Designed for demanding commercial-vehicle electrical loads
  • Available through heavy-duty replacement channels

Major Components

  • Rotor assembly
  • Stator assembly
  • Brushes and slip rings
  • Voltage regulator
  • Rectifier assembly
  • Front and rear bearings
  • Drive-end housing
  • Slip-ring-end housing
  • Dual internal cooling fans
  • Output terminal
  • Remote Sense terminal
  • Indicator and relay terminals where equipped
  • Pulley
  • Mounting ears or pad-mount housing
  • Internal electrical connections
  • Protective hardware and insulating components

Product Type and Construction

The 28SI is a wound-field alternator that uses brushes and slip rings to deliver excitation current to the rotating field assembly. This differs from a brushless alternator, which eliminates the sliding electrical contact between brushes and slip rings.

Its cast housings support the rotor, stator, bearings, rectifier, regulator, terminals, and mounting interfaces. Dual internal fans circulate cooling air through the assembly as the alternator turns.

How the Electrical Component or System Works

The engine drives the 28SI through a belt and pulley. Current passing through the rotor windings creates a magnetic field. As that field rotates inside the stator, it induces alternating current in the stator windings.

The rectifier converts the generated alternating current into direct current suitable for the vehicle’s batteries and electrical equipment. The voltage regulator adjusts rotor field current to maintain the required system voltage as engine speed and electrical demand change.

When Remote Sense is connected, the regulator monitors voltage at a remote electrical point rather than relying only on voltage measured directly at the alternator. This helps compensate for voltage drop through charging cables and connections.

Position and Function Within the Vehicle

The alternator is normally mounted to the engine and driven by the engine’s accessory belt system. Its output cable connects it to the battery and vehicle power-distribution system.

The 28SI supplies electrical power for lighting, engine and transmission controls, cab accessories, heating and air-conditioning equipment, safety systems, communication equipment, body systems, and other installed loads. It also restores energy removed from the batteries during starting and engine-off operation.

Common Specifications

  • Alternator Design: Brush type
  • 12-Volt Output Ratings: 160, 180, or 200 amps
  • 24-Volt Output Rating: 110 amps
  • Maximum Continuous Speed: 10,000 RPM
  • Maximum Intermittent Speed: 12,000 RPM
  • Rotation: Clockwise
  • Temperature Rating: 125°C or 257°F
  • Mounting: J180 short hinge, J180 long hinge, or pad
  • Polarity: Negative ground
  • Published Efficiency: Approximately 66 percent for 12-volt versions and 76 percent for 24-volt versions
  • Approximate Weight: 18.7 pounds or 8.5 kilograms
  • Stator Diameter: Approximately 5.67 inches or 144 millimeters
  • Length: Approximately 9.27 inches or 235.6 millimeters
  • Remote Sense: Standard

Exact terminals, pulley, mounting dimensions, output rating, and other details depend on the individual Delco Remy part number.

Operating Capacity and Performance

The 28SI’s usable output varies with alternator speed, temperature, system voltage, and electrical demand. Its rated output should not be interpreted as the current available at every engine speed.

Alternator pulley selection and engine accessory-drive ratio determine how quickly the alternator turns relative to the engine. The drive ratio must provide adequate low-speed output without exceeding the alternator’s speed limit at maximum engine RPM.

Installation Position and System Function

The alternator must be positioned so its mounting system, pulley alignment, belt wrap, belt tension, cooling airflow, electrical terminals, and service clearances match the engine installation.

A replacement alternator must perform the same electrical function as the original unit while matching the vehicle’s voltage, mounting, rotation, pulley, regulator, terminal, and wiring requirements.

System Voltage and Electrical Architecture

The 28SI is available for nominal 12-volt and 24-volt vehicle electrical systems. The alternator voltage must match the vehicle’s batteries, electronic controls, lighting, accessories, and power-distribution equipment.

A 12-volt alternator must not be substituted for a 24-volt model or the reverse. The complete part number should be used to verify system voltage and terminal configuration.

Electrical Input, Output, and Power Function

Mechanical input reaches the alternator through the pulley and shaft. The alternator converts this mechanical energy into regulated direct-current output.

The resulting current supports active electrical equipment and recharges the battery bank. A higher electrical load increases the mechanical effort required to drive the alternator.

Voltage, Current, and Electrical Load Management

The voltage regulator changes field current to control alternator output. When electrical demand rises or system voltage falls, the regulator increases excitation within the alternator’s operating limits. When demand decreases, it reduces field current.

The selected alternator should support the vehicle’s continuous electrical load while preserving enough reserve output to recharge the batteries. Repeated operation near or beyond available capacity can leave the batteries undercharged and increase alternator temperature.

Charging and Energy-Supply Function

The 28SI supplies power whenever engine and alternator speed are sufficient for charging. The batteries stabilize system voltage, support brief peak demands, and provide power when alternator output is unavailable or insufficient.

Alternator capacity should be evaluated against loads such as headlights, HVAC blowers, heated equipment, refrigeration controls, lift equipment, communication systems, body lighting, safety electronics, and engine-off hotel loads.

Circuit Design and Power Distribution

The charging circuit normally includes the alternator output terminal, charging cable, battery connections, grounds, circuit-protection devices, electrical distribution points, and monitoring circuits.

Cable size must be adequate for the alternator’s output and the length of the circuit. Undersized cables, loose terminals, damaged conductors, or corroded connections increase resistance and voltage drop.

Internal Components and Electrical Design

The rotor produces the rotating magnetic field, while the stator develops alternating current. The rectifier uses diodes to convert that current into direct current, and the regulator controls field excitation.

Because the 28SI is a brush-type design, its brushes and slip rings are functional wear points. Their condition can affect charging performance as operating hours accumulate.

Materials and Component Construction

The alternator incorporates cast housings, copper windings, steel rotating components, electronic rectification and regulation parts, insulating materials, bearings, seals, brushes, and application-specific plated terminals.

Material condition can be affected by heat, vibration, road chemicals, moisture, dust, oil contamination, and improper electrical connections.

Wiring, Terminals, Connectors, and Grounding

The output cable, Remote Sense lead, indicator or relay circuits, and ground path must match the selected alternator part number and vehicle wiring diagram.

Connection surfaces should be clean, secure, and protected from corrosion. A poor engine-to-frame or battery ground can create charging problems even when the alternator itself is operating correctly.

Circuit Protection and Electrical Safety

The charging circuit must use approved cable routing and appropriately rated protection where specified by the vehicle manufacturer. Cables must be kept away from exhaust components, sharp edges, rotating parts, and locations where movement can damage the insulation.

Incorrect polarity, accidental grounding of the output terminal, or disconnecting energized cables can damage components and produce dangerous arcing.

Controls, Monitoring, and Diagnostics

Depending on the vehicle, charging operation may be monitored through a voltmeter, charging warning lamp, body controller, engine controller, fleet telematics system, or diagnostic software.

Diagnosis should include measured voltage, current output, alternator speed, battery state of charge, cable voltage drop, belt condition, terminal integrity, and vehicle electrical demand.

Electronic Controls and Driver-Assistance Integration

The 28SI does not operate a driver-assistance feature directly, but it supplies electrical energy used by engine controls, transmission controls, ABS, stability systems, cameras, collision-warning equipment, telematics, and other electronic systems.

Low system voltage or unstable charging can produce warning messages and faults in systems that are otherwise mechanically sound.

Power Demand, Capacity, and Energy Management

Alternator selection should begin with an electrical-load analysis. The analysis should account for continuous loads, intermittent loads, low-idle operation, seasonal equipment, body accessories, and any planned additions.

A 200-amp model does not necessarily provide 200 amps at engine idle. Applications with long periods of low-speed operation must compare expected idle output with actual vehicle demand.

Power Consumption and System Efficiency

Producing electrical power places a mechanical load on the engine. Alternator efficiency determines how much engine power is required to produce a given electrical output.

Delco Remy publishes efficiency figures of approximately 66 percent for 12-volt 28SI configurations and 76 percent for 24-volt configurations. Actual vehicle results depend on speed, temperature, output demand, wiring condition, and drive-system losses.

Heat, Efficiency, and Electrical Loss Management

Heat is produced by winding resistance, diode losses, bearing friction, brush contact, and other conversion losses. Dual internal fans help control temperature by moving air through the alternator.

Blocked airflow, excessive current demand, high engine-compartment temperature, slipping belts, or high-resistance connections can increase operating temperature and shorten component life.

Environmental Sealing and Contamination Protection

The alternator should be protected from direct pressure washing, oil leaks, fuel, road chemicals, and heavy contamination. Openings required for cooling mean it should not be treated as a completely sealed electrical enclosure.

Application placement and protective shields should preserve cooling airflow while limiting exposure to damaging contaminants.

Duty Cycle and Operating Conditions

The 28SI is intended for demanding commercial service, but alternator life still depends on duty cycle. High continuous loads, extended idling, high ambient temperatures, frequent washdowns, severe vibration, and contaminated engine compartments can increase service demands.

The alternator should remain within its maximum continuous and intermittent speed limits throughout the engine’s operating range.

Mounting and Installation

Installation requires the correct mounting style, hardware, pulley alignment, belt arrangement, terminal orientation, cable capacity, grounding path, and clearance around the alternator.

The mounting structure must hold the alternator securely without housing distortion. Hardware and belt tension should be set according to the engine, vehicle, and alternator installation instructions.

Wiring, Grounding, and Installation Requirements

  • Disconnect battery power before installation
  • Verify system voltage and polarity
  • Match the original mounting arrangement
  • Use charging cables sized for output and circuit length
  • Clean and secure all terminal connections
  • Confirm a low-resistance ground path
  • Connect Remote Sense according to the approved wiring diagram
  • Protect wiring from heat, abrasion, and movement
  • Align the pulley with the accessory drive
  • Set belt tension according to vehicle specifications
  • Test charging voltage and cable voltage drop after installation

Vehicle and Electrical-System Compatibility

Compatibility depends on vehicle voltage, required amperage, engine mounting provisions, pulley dimensions, belt type, rotation, terminal configuration, ground arrangement, regulator function, and available installation space.

The vehicle identification number and original alternator part number should be used whenever possible. A physically mountable alternator may still be electrically or mechanically unsuitable.

Battery and Charging-System Compatibility

The alternator must be compatible with the battery-bank voltage, capacity, chemistry, wiring, isolators, disconnect switches, and charging controls used by the vehicle.

Weak or damaged batteries can force the alternator to operate at high output for extended periods. Batteries and charging cables should therefore be tested before a failed alternator is replaced.

Related Component and System Compatibility

The 28SI must work correctly with the engine accessory drive, tensioner, belts, batteries, starter, battery disconnect system, power-distribution network, monitoring circuits, and any auxiliary electrical equipment.

Changes to pulley diameter, battery-bank configuration, wiring, or vehicle electrical demand should be evaluated as part of the complete charging system.

Common Applications

  • Heavy-duty highway tractors
  • Regional-haul trucks
  • Vocational trucks
  • Dump trucks
  • Refuse vehicles
  • Construction equipment
  • Transit buses
  • School buses
  • Emergency vehicles
  • Utility trucks
  • Service trucks
  • Delivery vehicles
  • Specialized commercial equipment
  • Vehicles with substantial accessory loads

Advantages

  • Output ratings up to 200 amps in 12-volt applications
  • Available for 12-volt and 24-volt systems
  • Multiple commercial-vehicle mounting configurations
  • Dual internal cooling fans
  • Standard Remote Sense capability
  • Compact size relative to its output range
  • High published temperature rating
  • Supports demanding commercial electrical loads
  • Established heavy-duty replacement availability
  • Application-specific pulley and terminal options

Limitations or Considerations

  • Brushes and slip rings are wear components
  • Not all output ratings are available for both system voltages
  • Rated output is not available at every engine speed
  • Requires correct pulley alignment and belt tension
  • Incorrect Remote Sense wiring can affect voltage regulation
  • High-resistance cables can reduce delivered charging performance
  • Application-specific mounting and terminal differences prevent universal interchangeability
  • Heavy continuous loads can increase alternator temperature
  • Battery problems can overload a replacement alternator
  • Exact compatibility requires the complete part number

Driver and Operator Experience

A correctly sized and operating 28SI should provide stable electrical performance without requiring routine driver input. The driver may notice charging-system problems through dim lighting, slow starting, warning lamps, low-voltage messages, accessory malfunctions, or repeated battery failures.

Vehicles with high electrical demand may show lower voltage during prolonged idle operation if demand exceeds available idle output.

Controls, Indicators, and Driver Feedback

  • Charging-system warning lamp
  • Dashboard voltmeter
  • Low-voltage warning message
  • Body-controller alerts
  • Engine-controller diagnostic codes
  • Battery-monitoring display
  • Telematics-based voltage reporting
  • Accessory shutdown or load-shedding alerts

Common Electrical Tests and Diagnostic Information

  • Battery state-of-charge test
  • Battery load or conductance test
  • Charging-voltage measurement
  • Alternator current-output test
  • Positive-cable voltage-drop test
  • Ground-side voltage-drop test
  • Parasitic-draw test
  • Belt and tensioner inspection
  • Pulley and bearing inspection
  • Remote Sense circuit test
  • AC-ripple test for rectifier faults
  • Diagnostic-code review where supported

Inspection and Wear Points

  • Drive belt
  • Belt tensioner
  • Alternator pulley
  • Mounting brackets and fasteners
  • Output terminal and cable
  • Remote Sense connection
  • Ground connections
  • Electrical connectors
  • Housing ventilation openings
  • Front and rear bearings
  • Brushes and slip rings
  • Wiring insulation
  • Evidence of overheating
  • Oil, coolant, fuel, or road-contaminant exposure

Cooling, Ventilation, and Environmental Requirements

Cooling openings must remain unobstructed, and the installation should allow heated air to move away from the alternator. Oil-soaked debris and road contamination can restrict airflow and trap heat.

Direct high-pressure washing should be avoided. Fluid leaks above or near the alternator should be corrected before they damage insulation, bearings, brushes, or electronic components.

Component Service Life and Rebuildability

Service life varies with electrical loading, alternator speed, temperature, vibration, contamination, belt condition, battery health, and maintenance. Brushes, slip rings, bearings, regulators, and rectifiers may eventually require attention.

Depending on part availability and service policy, an affected alternator may be repaired, professionally rebuilt, replaced with a remanufactured unit, or replaced with a new assembly.

Maintenance and Ownership Notes

  • Keep batteries properly charged and maintained
  • Inspect belts and tensioners regularly
  • Check alternator mounting hardware
  • Keep terminals clean and tight
  • Inspect output and ground cables for heat damage
  • Measure voltage drop when charging performance declines
  • Keep cooling openings free of debris
  • Correct oil, fuel, and coolant leaks
  • Investigate repeated low-voltage warnings
  • Test batteries before installing a replacement alternator
  • Verify charging performance after installation
  • Use the full Delco Remy part number when ordering components

Common Electrical-System Problems

  • Low charging voltage: A loose belt, poor connection, weak ground, damaged charging cable, failed regulator, worn brushes, or internal alternator fault may reduce voltage.
  • No alternator output: An open circuit, failed excitation circuit, broken belt, worn brushes, damaged rotor, failed regulator, or rectifier failure may prevent charging.
  • Overcharging: Incorrect sensing, a damaged Remote Sense circuit, poor connection, or regulator failure can produce excessive voltage.
  • Repeated battery discharge: Alternator undersizing, excessive idle loads, defective batteries, parasitic draw, or high circuit resistance may leave the battery bank undercharged.
  • Excessive belt noise: Misalignment, incorrect tension, pulley damage, belt wear, or alternator-bearing resistance can cause squeal or chirping.
  • Overheating: Excessive electrical demand, restricted airflow, damaged diodes, poor connections, or high engine-compartment temperature can increase heat.
  • Electrical interference: Rectifier problems, poor grounding, damaged wiring, or improper installation can introduce unwanted electrical noise.
  • Intermittent charging: Worn brushes, damaged slip rings, loose wiring, vibration, or heat-sensitive internal faults can cause output to come and go.

Safety and Service Precautions

Battery power should be disconnected according to the vehicle manufacturer’s procedure before alternator wiring is removed. The output terminal can carry enough current to cause severe arcing, burns, component damage, or fire if accidentally grounded.

Technicians should keep tools, clothing, and hands away from belts, pulleys, fans, and other rotating parts. Electrical testing with the engine running requires appropriate instruments, protective equipment, and safe service procedures.

Never disconnect a battery cable to test whether an alternator is charging. Doing so can create voltage spikes and damage electronic equipment.

Identification Information

The alternator identification label or tag should be inspected before a replacement is ordered. Record the following information:

  • Delco Remy model family
  • Complete part number
  • Serial or manufacturing information
  • System voltage
  • Rated amperage
  • Mounting configuration
  • Rotation
  • Pulley type and diameter
  • Belt-groove arrangement
  • Terminal sizes and locations
  • Remote Sense configuration
  • Vehicle manufacturer and model
  • Engine model
  • Vehicle identification number

Buying Considerations

  • Confirm whether the vehicle uses a 12-volt or 24-volt system
  • Calculate continuous and peak electrical demand
  • Check expected alternator output at operating and idle speeds
  • Match the required amperage rating
  • Verify J180 short-hinge, J180 long-hinge, or pad mounting
  • Match pulley diameter and belt grooves
  • Confirm clockwise rotation
  • Verify terminal sizes and positions
  • Confirm Remote Sense wiring requirements
  • Check available engine-compartment clearance
  • Inspect battery and charging-cable condition
  • Compare new and remanufactured replacement options
  • Use the original part number and vehicle VIN for verification

Variants and Configurations

  • 12-volt 160-amp configurations
  • 12-volt 180-amp configurations
  • 12-volt 200-amp configurations
  • 24-volt 110-amp configurations
  • J180 short-hinge mounting
  • J180 long-hinge mounting
  • Pad mounting
  • Different pulley diameters
  • Different belt-groove arrangements
  • Application-specific terminal orientations
  • New replacement assemblies
  • Remanufactured replacement assemblies where available

Comparison to Similar Equipment

Compared with the Delco Remy 24SI Heavy-Duty Alternator, the 28SI offers additional output choices reaching 200 amps in 12-volt applications. Both are brush-type designs, but their ratings, mounting arrangements, dimensions, and part-number-specific connections must be verified independently.

Compared with the Delco Remy 36SI High-Output Alternator, the 28SI uses brushes and slip rings. The 36SI uses a brushless design that eliminates those sliding electrical wear points.

Compared with the Delco Remy 40SI Heavy-Duty Brushless Alternator, the 28SI has lower maximum output but is smaller and lighter. The 40SI is intended for applications requiring substantially greater electrical capacity.

Compared with a lower-output alternator, the 28SI can support more vehicle accessories and provide greater charging reserve when it is correctly matched to the accessory drive and electrical system.

Best Fit For

  • Vehicles originally equipped with a compatible 28SI
  • 12-volt systems requiring as much as 200 amps
  • 24-volt systems requiring a compatible 110-amp alternator
  • Highway trucks with substantial accessory loads
  • Vocational vehicles with body-mounted electrical equipment
  • Buses with lighting, HVAC, and passenger-equipment loads
  • Construction and utility equipment
  • Fleets seeking an established heavy-duty brush-type alternator
  • Applications requiring standard Remote Sense capability
  • Vehicles using compatible J180 or pad mounting

Related Vehicle and Trailer Types

Related Truck and Trailer Models

Related Electrical System Types

Related Electrical Products

Related Equipment Systems

Related Guides

Regulatory and Compliance Notes

Alternator installation must preserve the vehicle’s required lighting, braking, emissions, safety, and electronic-control functions. Wiring changes should comply with vehicle-manufacturer requirements and applicable commercial-vehicle electrical standards.

Replacement capacity does not authorize charging cables, circuit protection, batteries, or electrical equipment to be operated beyond their ratings. Modified vehicles should receive an appropriate electrical-load and installation review.

Real World Operating Notes

A vehicle can show acceptable charging voltage while still having insufficient charging capacity under full load. Current output and voltage drop should therefore be measured while representative electrical equipment is operating.

Repeated alternator replacement without battery, cable, belt, and load testing can leave the original cause unresolved. Poor batteries and high-resistance connections are common contributors to charging complaints.

Remote Sense can improve voltage regulation at the principal electrical load point, but only when its wiring and connection are correct. A damaged sensing circuit can produce inaccurate charging voltage.

Frequently Asked Questions

What is the Delco Remy 28SI?

The 28SI is a heavy-duty brush-type alternator designed for commercial vehicles and equipment with demanding electrical loads.

Is the Delco Remy 28SI brushless?

No. The 28SI is a brush-type alternator that uses brushes and slip rings to supply current to the rotor.

How much output does the 28SI provide?

Published ratings include 160, 180, and 200 amps for 12-volt configurations and 110 amps for 24-volt configurations.

Does the 28SI include Remote Sense?

Yes. Delco Remy lists Remote Sense as a standard 28SI feature, although the vehicle must have the correct sensing-circuit installation.

What mounting configurations are available?

The family includes J180 short-hinge, J180 long-hinge, and pad-mount configurations.

Can a higher-amperage 28SI replace a lower-output alternator?

Possibly, but the mounting, pulley, belt drive, wiring, cable capacity, circuit protection, terminals, regulator functions, and electrical system must all support the change.

Why does the vehicle still show low voltage at idle?

Electrical demand may exceed available idle output. Other possible causes include weak batteries, belt problems, cable resistance, poor grounds, incorrect pulley selection, or an alternator fault.

What causes an alternator to overheat?

Excessive electrical demand, weak batteries, blocked airflow, high-resistance connections, damaged internal components, excessive speed, or high surrounding temperatures can cause overheating.

How is the correct replacement identified?

Use the complete Delco Remy part number, voltage, output rating, mounting style, pulley, rotation, terminal arrangement, vehicle VIN, and engine information.

Should the batteries be tested before replacing the alternator?

Yes. Weak or damaged batteries can overload the alternator and may cause a new unit to experience the same charging complaint.

Availability and Where to Find

Delco Remy 28SI alternators may be available through commercial-truck dealers, heavy-duty electrical specialists, fleet-parts suppliers, equipment dealers, authorized distributors, and qualified online parts sources.

Availability varies by voltage, output, mounting style, pulley, terminal arrangement, and new or remanufactured status. Buyers should verify the complete part number rather than ordering by the 28SI family name alone.

Current product information, replacement cross-references, technical support, and distributor resources are available through the Delco Remy website.

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