Part #: 20021

Remy 20021 Alternator

Premium Remanufactured
⚙️ 24 vehicles fit this part
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Select your vehicle to confirm fitment
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OE Direct Replacement — Bolt-on fit, no modifications needed
📦Premium Remanufactured
🚗Fitment: Ram, 2500 and 3500
🔄Easy Returns — Return within 60 days for a full refund
🚚Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Alternator for Ram 2500 and 3500 Vehicles

The Remy Premium Remanufactured Alternator 20021 is designed to restore your Ram 2500 or 3500's electrical charging system with dependable performance. This remanufactured alternator meets strict quality standards and is engineered to match original equipment specifications.

  • Amperage Rating: 220 amps for consistent power output
  • Internal fan type for efficient cooling
  • Remanufactured to OEM standards by Nippondenso
  • Includes pulley for straightforward installation
  • Clockwise rotation direction compatible with Ram 2500 and 3500 models
  • 12-volt system voltage
  • External voltage regulator type for reliable voltage control

About the Premium Remanufactured Product Line

The Premium Remanufactured line from Remy offers alternators that have been carefully rebuilt to meet or exceed original equipment manufacturer (OEM) specifications. Each unit undergoes thorough testing and quality checks to ensure durability and performance. This line is ideal for customers seeking a cost-effective alternative to new parts without compromising on reliability, specifically tailored for vehicles like the Ram 2500 and 3500.

Detailed Product Description

This Remy alternator, part number 20021, is a remanufactured unit designed to provide 220 amps of electrical output, suitable for heavy-duty applications in Ram 2500 and 3500 trucks. Featuring an internal fan, it maintains optimal operating temperatures during extended use. The included pulley simplifies replacement, and the clockwise rotation matches the original equipment setup. The external voltage regulator ensures stable voltage delivery to your vehicle’s electrical system, supporting consistent battery charging and electrical component operation.

Common Applications and Issues Addressed

  • Restores charging system functionality in Ram 2500 and 3500 trucks
  • Resolves battery drain or failure to charge issues
  • Eliminates dimming or flickering lights caused by alternator faults
  • Replaces noisy or overheating alternators with internal fan cooling
  • Corrects voltage irregularities due to faulty voltage regulators

Installation Notes and Tips

When installing the Remy 20021 alternator, ensure the clockwise rotation matches your vehicle’s original alternator. The included pulley allows for direct replacement without additional parts. Verify the external voltage regulator connections are secure and compatible with your Ram 2500 or 3500 model. It is recommended to test the charging system after installation to confirm proper operation.

Quality Assurance and Warranty

Remy’s Premium Remanufactured alternators undergo comprehensive testing to meet OEM standards. Each unit is inspected for electrical output, mechanical integrity, and durability. While specific warranty details may vary, Remy typically offers coverage to protect against defects in materials and workmanship, providing confidence in the part’s reliability for your Ram 2500 or 3500.

BrandRemy
Part Number20021
PositionPremium Remanufactured
Amperage Rating220
Fan TypeInternal
New or RemanufacturedRemanufactured
OE ManufacturerNippondenso
Pulley IncludedYes
Rotation DirectionClockwise
Voltage (V)12
Voltage Regulator TypeExternal

This part fits 24 vehicles. Search below:

YearMakeModelLitersCylindersPositionNotes
2024Ram25006.7LL6N/A220 Amps; Premium Remanufactured
2024Ram35006.7LL6N/A220 Amps; Premium Remanufactured
2023Ram25006.7LL6N/A220 Amps; Premium Remanufactured
2023Ram35006.7LL6N/A220 Amps; Premium Remanufactured
2022Ram25006.7LL6N/A220 Amps; Premium Remanufactured
2022Ram35006.7LL6N/A220 Amps; Premium Remanufactured
2021Ram25006.7LL6N/AAuxiliary Alt; 220 Amps; Premium Remanufactured
2021Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2020Ram25006.7LL6N/AAuxiliary Alt; 220 Amps; Premium Remanufactured
2020Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2019Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2019Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2018Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2018Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2017Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2017Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2016Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2016Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2015Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2015Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2014Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2014Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2013Ram25006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
2013Ram35006.7LL6N/ADual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

421000-714056029707AA56029707AB56029707AC

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.