Delco Remy Heavy Duty Alternators

Delco Remy Heavy Duty Alternators

Superior Performance for OE and Aftermarket Applications

Delco Remy alternators mean premium quality, increased efficiency, and measurable fuel savings for the commercial and off-road vehicle industry worldwide. 

From brushless designs with fewer moving parts to remote sense to improve battery charge time, Delco Remy technology is second to none. We continue to leverage our experience to provide our OE and aftermarket partners with innovative solutions for today’s vehicle electric system challenges.

 

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  • Complete portfolio: From 70 to 450 Amp (24V).
  • Efficient: Units are lighter weight and feature our proprietary stator design that uses less engine horsepower and translates to substantial fuel savings. 
  • Durable: Units are available with brushless design – fewer moving parts means less wear and longer life.
  • Outstanding performance: Units are available with Remote Sense technology – which can reduce battery charge time by 50%.

Alternators by Vehicle Type

Delco Remy Alternator Models

22SI Brush Type Alternator

Delco Remy 22SI™ Brush Alternator

The 22SI™ is a brush type alternator for medium and heavy duty applications with output up to 150 amps and offered in a J180 and pad mounting configurations.

23SI Brushless Alternator

Delco Remy 23SI™ Brushless Alternator

The 23SI™ is a brushless alternator designed for construction, industrial, medium or heavy duty applications.  The 23SI is offered in 12 volt outputs up to 145 Amps and 24 volt up to 70 Amps.  The 23SI is available in J180 and pad mounting configurations.

24SI Brush Type Alternator

Delco Remy 24SI™ Brush Alternator

 The 24SI brush style alternators are designed with dual internal fans which provide maximum cooling technology, improves the operating efficiency and durability of the unit. The 24SI is offered in 12 volt models with output up to 160 Amps and 24 volt models up to 70 amps.  The 24SI is available in J180 or pad mounting configurations.

28SI High Output Brush Alternator

Delco Remy 28SI™ High Output Brush Alternator

The 28SI high output alternator was designed to address vehicle applications that require higher electrical output, but also want lower weight, improved temperature capability, and fuel savings.  Vehicles, such as school buses, not using a premium high output alternator will likely experience premature failures due to high under-hood engine temperatures.  The 28SI brush style alternators are designed with dual internal fans which provide maximum cooling technology, improves the operating efficiency and durability of the unit. The 28SI comes standard with Remote Sense and is available in outputs ranging from 160 to 200 amps.  The 28SI is available in short J180 hinge, long J180 hinge, and pad mounting configurations.

33SI Heavy Duty Brushless Alternator

Delco Remy 33SI™ Heavy Duty Brushless Alternator

The 33SI is a heavy duty brushless alternator that provides more output and service life for today’s diesel powered vehicles with large electrical load requirements. With the increased demand for extended service life products, Delco Remy’s Brushless Alternators are quickly becoming the standard of the industry. The 33SI is offered in 12 volt and 24 volt models with a J180 hinge mount.

34SI Heavy Duty Brushless Alternator

Delco Remy 34SI™ Heavy Duty Brushless Alternator

The Delco Remy 34SI is a brushless alternator designed for medium and heavy duty applications and performs well in high vibration applications generating the standard of quality and performance.  The absence of moving electrical connections eliminates sparks. The 34SI has excellent radio frequency interference (RFI) suppression with very little parasitic draw and a low turn-on speed.  A special coating protects the electronics from dirt, road salt and other corrosives. 

35SI Brushless Alternator

Delco Remy 35SI™ Heavy Duty Brushless Alternator

The Delco Remy 35SI heavy duty alternator, designed for high-underhood-temperature EGR and ACERT* engines, features heat dissipating radiant vents and thermally tolerant internal components that ensure high output in environments up to 105°C / 221°F. The 35SI features a brushless design with fewer moving parts and internal connections, resulting in consistently superior performance and contamination resistance and longer product life compared to traditional brush-type alternators.

36SI Brushless Alternator

Delco Remy 36SI™ High Output Brushless Alternator

The 36SI™ is a durable brushless model available in an output rating up to 170 Amps at 12 volts or up to 105 Amps at 24 Volts. The premium brushless design of the Delco Remy 36SI provides added durability and life of the alternator.  Remote Sense is optional on the Delco Remy 36SI. The durable and fuel efficient 36SI has quickly become the new fleet standard.  Upgrade from the 33SI, 34SI & 35SI models and competitive models to 36SI and dramatically reduce inventory costs.
Delco Remy 38SI High Output Brushless Alternator

Delco Remy 38SI™ High Output Brushless Alternator

The 38SI™ is a durable brushless model available in an output rating of 215 Amps. Its efficiency rating is best-in-class.  High efficiency translates to less engine horsepower requirements, resulting in substantial fuel savings.  The premium brushless design of the Delco Remy 38SI provides added durability and life of the alternator.  Remote sense is standard on the Delco Remy 38SI.

Delco Remy 40SI™ High Output Brushless Alternator

Delco Remy 40SI™ High Output Brushless Alternator

The 40SI™ is a durable brushless model available in output ranging from 240 to 320 Amps. Its efficiency rating is best-in-class.  High efficiency translates to less engine horsepower requirements, resulting in substantial fuel savings. The 40SI is available with three mounting styles allowing flexibility when switching form a competitive model.  The premium brushless design of the Delco Remy 40SI provides added durability and life of the alternator.  Remote sense is standard on all 40SI models.

 

55SI™ Brushless Type Alternator

Delco Remy 55SI™ High Output Heavy Duty Brushless Alternator

From 12 volt applications such as utility & work trucks, fire trucks, and long haul trucks with auxiliary power units to 24 volt applications like wheel loaders, graders and mining equipment, the Delco Remy 55SI is designed to take on the demanding electrical loads of today's heavy duty vehicles. The 55SI produces up to 430 amps at 12 volts and up to 275 amps at 24 volts.  
Delco Remy 50DN High Output Heavy Duty Brushless Alternator

Delco Remy 50DN™ High Output Heavy Duty Brushless Alternator

The 50DN is designed for transit bus and motor coach applications.  Providing 270 amps at 24 volts the 50DN provides plenty of power at low engine speeds. The 50DN is oil cooled and offered in gear drive and belt drive configurations. 
Delco Remy 50DN+ High Output Heavy Duty Brushless Alternator

Delco Remy 50DN+™ High Output Heavy Duty Brushless Alternator

The 50DN+ provides 450 amps in the same 50DN 270 amp package.  The 50DN+ is the logical upgrade made for today's buses equipped with inverters, additional lighting, electric cooling fans or electric power steering.  The 50DN+ uses the same 50VR regulator and same oil and vent lines.
Delco Remy T1 Type Heavy Duty Transit Alternator

Delco Remy T1 Type Heavy Duty Transit Alternator

The T1 alternator provides up to 185 Amps for transit bus and motor coach applications

Features

Remote Sense

Reduce battery charge time by 50%.

A major fleet reported to us that their Delco Remy Alternators equipped with Remote Sense reduced battery charge time by 50% and decreased battery warranty claims by 30%.  Remote Sense utilizes a second wire that reads the actual voltage at the battery and signals the alternator to increase its voltage output to compensate for the voltage drop, ensuring a constant 14 volts at the battery.  The additional voltage forces the current into the battery faster,  bringing it to a full state of charge in half the time.

Remote Sense is ideal for any commerical vehicle that makes frequent stops including:

  • School buses
  • Trucks with lift gates
  • Delivery trucks  
With Remote Sense

Why use Remote Sense?

Due to resistance in charging cables caused by environmental factors and other conditions, the voltage from the alternator drops by the time it reaches the battery. Just because the alternator is sending 14 volts doesn’t mean that the battery is receiving 14 volts. That’s why we’ve included Remote Sense on all premium models. With Remote Sense, a second wire reads the actual voltage at the battery and signals the alternator to increase its voltage output to compensate for voltage drop, ensuring a constant 14 volts at the battery. Research has shown that an increase of just ½ volt, when needed, can cut the battery charge time in half. At the end of the day, it can make the difference between batteries that are fully charged and those that aren’t.

Without Remote Sense

How to Connect Remote Sense

Remote Sense Terminal Monitors system voltage at the batteries or a common distribution point. The Remote Sense terminal is identified with a “Remote Sense” label on the back cover plate or an “S” Terminal. Notice! Do not connect anything but the Remote Sense line to this terminal. • If installing an alternator with Remote Sense capabilities in a vehicle that does not have a Remote Sense line, connect a fused (5 Amp) insulated wire from the Alternator Remote Sense terminal to the positive (+) battery terminal or the common distribution point such as the starter solenoid battery (+) terminal. Use a #16 gauge red insulated wire, preferably with a 1/4” ID Convoluted Polyethylene Conduit. Also install a standard inline fuse holder with a protective cap. Use a low voltage (5 Amp) automotive standard blade style fuse. Connection of the Remote Sense terminal is best for optimum performance; however, the alternator will function without Remote Sense connected. • If installing a non-Remote Sense alternator in a vehicle that has a Remote Sense line, disconnect and secure the wire from the battery. • Only connect the Remote Sense line to the Remote Sense terminal. The “R” and “I” Terminals are not the Remote Sense Terminal!

Remote Sense is a feature available on Delco Remy alternator models: 35SI™36SI™, and standard on the high output alternator models 28SI™38SI™40SI™, and 55SI™.

The Brushless Advantage

Say Goodbye to the Brush...Say Hello to Durability & Reliability

Delco Remy Heavy Duty Brushless Alternators have fewer moving parts. Fewer moving parts mean less wear on the alternator. What you end up with is longer life, not to mention the best warranty in the industry to back it.

Alternators pull air through from the back to the front in order to cool the internal electronics. This causes dust to enter into the alternator. With a brushless alternator, there are no issues of dust hanging up brushes and causing early failure. Without brushes, there are 13 fewer moving parts, eliminating components that wear out, while extending overall products life.

All major internal components that carry current such as a field coil, regulator, bridge, connectors, and stator, are stationary components and more resistant to vibration and debris.

Delco Remy Brushless Models:  35SI™, 36SI™, 38SI™, 40SI™, 55SI™

10 Things that Won't Go Wrong with a Delco Remy Brushless Alternator

  1. Stuck Brush
  2. Broken Brush
  3. Brush Bounce
  4. Worn Out Brush
  5. Corroded Slip Ring
  6. Shorted Slip Ring
  7. Broken Brush Spring
  8. Broken Brush Shunt
  9. Grounded Rotor Coil
  10. High Turn-On

Fuel Economy Calculator

 Increasing alternator efficiency can, and will measurably reduce diesel fuel costs.  Electrical power on a heavy duty truck is not free.  It comes as a direct result of consuming fuel within the engine to drive the alternator. 

Go to Fuel Economy Calculator

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