Remy 20021 Alternator

Remanufactured 220 Amp Alternator for Ram

The Remy Premium Remanufactured 20021 alternator is a 12-volt charging component built for select Ram heavy-duty applications. It features a 220 amp rating, internal fan design, clockwise rotation, an included pulley, and an external voltage regulator setup for the specified OE-style configuration.

Key Features

• Remy Premium Remanufactured alternator
• 220 amp output for high-demand charging systems
• 12-volt electrical system
• Internal fan design
• Clockwise rotation
• Pulley included
• External voltage regulator type
• OE manufacturer reference: Nippondenso

Product Details

Built as a remanufactured replacement for the original charging unit, this Remy alternator is specified for Ram 2500 and Ram 3500 trucks with the listed auxiliary or dual alternator configurations. The Remy 20021 cross-references OE and aftermarket numbers 421000-7140 and 56029707AA, 56029707AB, 56029707AC for the same application. It is a direct-fit charging system component for Ram 2500 and Ram 3500 models where the vehicle uses the matching 220 amp auxiliary alternator setup.

What This Alternator Helps Address

• Battery warning lights caused by weak charging output
• Low system voltage during towing or accessory use
• Charging failure from worn internal electrical components
• Noise or performance issues from a failing alternator assembly
• Reduced charging capacity in dual alternator or auxiliary alternator systems

Fitment Notes and Installation

• Fits 2022-2024 Ram 2500, N/A; 220 Amps; Premium Remanufactured
• Fits 2022-2024 Ram 3500, N/A; 220 Amps; Premium Remanufactured
• Fits 2020-2021 Ram 2500, N/A; Auxiliary Alt; 220 Amps; Premium Remanufactured
• Fits 2013-2021 Ram 3500, N/A; Dual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured
• Fits 2013-2019 Ram 2500, N/A; Dual Alt System; Auxiliary Alt; 220 Amps; Premium Remanufactured

Verify the vehicle’s alternator configuration, amperage rating, rotation direction, and voltage regulator type before installation. This part is specified for Ram 2500 and Ram 3500 applications with the matching auxiliary or dual alternator arrangement, so confirming the OE number and system layout is important for proper fitment.

Quality Assurance

Remy Premium Remanufactured parts are remanufactured to restore core charging-system function for the listed application. The OE manufacturer reference is Nippondenso, which helps identify the original equipment design family for this Ram 2500 / Ram 3500 alternator replacement.