FREIGHTLINER DR8400251 Alternator MT45

( Manufacturer Part Number: DR8400251 ), ( Type: Alternator ), ( Color: Gray ), ( Material: Metal )

Review FREIGHTLINER Oem Alternator See Desc fits 2020–2021

The Freightliner DR8400251 alternator is a crucial component in the electrical system of your 2020-2021 Freightliner MT45 truck. Designed and manufactured by Freightliner, this alternator is engineered to meet the specific electrical demands of these heavy-duty vehicles.

This alternator comes with a robust 251-ampere output capacity, ensuring that your truck's battery is consistently charged, even during the most demanding operating conditions. The DR8400251 alternator features a durable, three-phase design that delivers efficient power output and is built to withstand the rigors of commercial trucking applications.

The alternator housing is made from high-strength aluminum, which not only provides excellent heat dissipation but also contributes to the overall weight reduction of the vehicle. The DR8400251 alternator also boasts a heavy-duty, 12-rib serpentine belt system, which helps ensure reliable and consistent power transmission from the engine to the alternator.

This alternator is equipped with a diode rectifier that converts the alternating current produced by the alternator into direct current for storage in the battery. It also features an automatic voltage regulator (AVR) that maintains the battery voltage at an optimal level, preventing overcharging and undercharging.

The Freightliner DR8400251 alternator is designed to be a direct replacement for the original equipment alternator on 2020-2021 Freightliner MT45 trucks. It comes with a comprehensive warranty, providing peace of mind and assurance against any manufacturing defects.

In summary, the Freightliner DR8400251 alternator is a high-performance, heavy-duty alternator specifically designed for the electrical system of 2020-2021 Freightliner MT45 trucks. It offers a robust 251-ampere output capacity, a durable three-phase design, and a high-strength aluminum housing, ensuring reliable, efficient, and consistent power output for your commercial vehicle.

The Freightliner DR8400251 alternator is a popular choice for powering the electrical systems in various Freightliner models, including the Mt45 series for the years 2020 and 2021. Before making a decision to purchase this alternator, it's essential to consider its pros and cons.

1. High Power Output: The DR8400251 alternator can produce up to 400 amps at 13.8 volts, which is more than enough power for most heavy-duty applications.

2. Durability: Freightliner is known for manufacturing robust components, and this alternator is no exception. It's designed to withstand the rigors of heavy-duty use.

3. Easy Installation: The alternator comes with a wiring harness that simplifies the installation process. Additionally, it's a direct replacement for the OEM alternator, making the process even easier.

4. Reliability: This alternator has a proven track record of reliability, and it's less likely to fail compared to aftermarket alternatives.

1. Cost: The DR8400251 alternator is more expensive than some aftermarket alternatives. However, its high power output, durability, and reliability may justify the higher price.

2. Weight: This alternator is heavier than some aftermarket alternatives, which can add extra weight to the vehicle.

3. Limited Availability: It may not be as readily available as aftermarket alternatives from various suppliers. However, it can be ordered directly from Freightliner or through authorized dealers.

The Freightliner DR8400251 alternator is an excellent choice for those seeking a high-performing, durable, and reliable alternator for their 2020-2021 Mt45 series Freightliner truck. Although it comes with a higher price tag, its advantages, such as ease of installation, power output, and reliability, make it a worthwhile investment.

If you're looking for a high-quality alternator that can handle the demands of heavy-duty applications, the Freightliner DR8400251 alternator is an excellent choice. While it may cost more than some aftermarket alternatives, its reliability, power output, and ease of installation make it a worthwhile investment.

Details:

New but connector plastic has some damage see pictures.

part #: dr8400251 prices

• $95.00-$99.99

specifications altnagen:

• for makes: Freightliner
• for years: 2020-2021
• mpn: Dr8400251
• type: Alternator
• color: Gray
• material: Metal

payments altnagen:

• credit card: Discover
• other
• wallet: Google-pay

general altnagen:

• condition: New
• Car Truck Parts Accessories > Starters, Alternators, ECUs Wiring > Alternators Generators

returns altnagen:

• time: 30 Days
• paid by: Seller
• policy: Returns Accepted

shipping altnagen:

• type: Fixed
• transit: 4-8 Days
• cost: $0.00
• service: Standard, Expedited
• class: Standard, Expedited

offer altnagen:

• started: October 12, 2025
• availability: In Stock
• sold: 0
• options: Ship-to-home
• quantity: 1

seller altnagen:

• rating: 99.5%
• city: Ogden, Utah
• # reviews: 71840

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