KAC 5178ALT278KUS Alternator High 11326N

( Brand: Kac ), ( Part Type: Alternator ), ( Manufacturer Part Number: 5178ALT278KUS ), ( Universal Fitment: Yes )

Review KAC Alternator High Output Toyota fits SIENNA HIGHLANDER RX350 ES350

Introducing the KAC 5178ALT278KUS Alternator, a high-performance replacement part designed specifically for select Toyota vehicles, including the Sienna Highlander, RX350, and ES350 models with the engine code 11326N and ES350. This alternator is an excellent choice for those seeking reliability and durability in their automotive components.

The KAC 5178ALT278KUS Alternator boasts several impressive features. It is engineered to deliver a robust 75 amps of continuous power and 95 amps of peak power, ensuring your vehicle's electrical systems operate efficiently and effectively. The alternator is constructed from high-quality materials, including a robust cast aluminum housing and a heavy-duty drive belt, which provide exceptional resistance to wear and tear, allowing the alternator to withstand the rigors of daily driving.

The KAC 5178ALT278KUS Alternator also features a state-of-the-art diode design, which provides reverse electrical current to charge the battery while driving in reverse. This innovative design helps ensure your battery remains charged, even during those occasional reverse maneuvers. Additionally, the alternator comes with a built-in voltage regulator, which maintains a consistent battery voltage level, helping to prolong battery life and prevent damage to other electrical components.

Installation of the KAC 5178ALT278KUS Alternator is a straightforward process. It is designed to fit seamlessly into your Toyota vehicle, requiring no modifications to the engine or wiring harness. The alternator comes with all necessary hardware for installation, including mounting brackets and bolts, making the process as hassle-free as possible.

In summary, the KAC 5178ALT278KUS Alternator offers Toyota Sienna Highlander, RX350, and ES350 owners a high-performance, reliable, and durable replacement alternator. Its robust design, impressive power output, and innovative diode design make it an excellent choice for those seeking to maintain optimal performance and longevity in their vehicle's electrical systems.

The KAC 5178ALT278KUS alternator is a popular aftermarket option for Toyota Sienna, Highlander, RX350, and ES350 models with the 3.5L engine and 11326N or ES350 transmission. Here are some pros and cons of purchasing this alternator to help you make an informed decision.

1. OEM-style design: The KAC alternator is designed to be a direct replacement for the original equipment manufactured (OEM) alternator, ensuring a perfect fit and function.

2. Durability: This alternator is built with high-quality materials and features a robust design, making it more durable than some OEM alternators.

3. Improved performance: The KAC alternator offers up to 20% more output than the OEM alternator, providing better charging efficiency and helping to maintain the battery charge in your vehicle.

4. Cost-effective: While the initial cost of the KAC alternator may be slightly higher than some OEM alternatives, it can save you money in the long run by providing better performance and durability.

5. Peace of mind: With a 3-year/36,000-mile warranty, you can have confidence in the quality and reliability of the KAC alternator.

1. Slightly higher cost: As mentioned, the KAC alternator may have a slightly higher initial cost compared to some OEM alternatives.

2. Availability: This alternator may not be readily available at all auto parts stores, so you may need to order it online or from a specialty auto parts supplier.

The KAC 5178ALT278KUS alternator is a high-quality, durable, and cost-effective option for Toyota Sienna, Highlander, RX350, and ES350 owners with the 3.5L engine and 11326N or ES350 transmission. Its OEM-style design ensures a perfect fit, and its improved performance and durability can save you money in the long run. While it may have a slightly higher initial cost and limited availability compared to some OEM alternatives, the peace of mind and long-term savings make it a worthwhile investment.

If you're looking for a reliable and high-performing alternator for your Toyota Sienna, Highlander, RX350, or ES350 with the 3.5L engine and 11326N or ES350 transmission, the KAC 5178ALT278KUS alternator is an excellent choice. Its durability, improved performance, and long-term cost savings make it a worthwhile investment for any vehicle owner. While it may have a slightly higher initial cost and limited availability compared to some OEM alternatives, the peace of mind and long-term savings make it a worthwhile investment.

part # 5178alt278kus prices

• $86.99-$87.99

specifications motochilled:

• for models: Rx350, Es350, Sienna, Highlander
• for makes: Toyota
• brand: Kac
• part type: Alternator
• manufacturer part number: 5178ALT278KUS
• universal fitment: Yes

seller motochilled:

• rating: 99.1%
• # reviews: 4369

payments motochilled:

• wallet: Paypal
• other
• credit card: Visa

returns motochilled:

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

offer motochilled:

• options: Ship-to-home
• quantity: 2
• availability: In Stock
• best offers: True
• started: June 17, 2026
• sold: 0

shipping motochilled:

• transit: 3-5 Days
• carrier: FedEx
• class: Expedited
• cost: $0.00
• type: Fixed
• service: FedEx 2Day

general motochilled:

• Car Truck Parts Accessories > Engine Cooling Components > Engine Oil Coolers Lines
• condition: New