This 400-amp high-output alternator is engineered for demanding Nissan applications where consistent, high-current power is critical. Designed for vehicles running large audio systems, auxiliary electronics, winches, lighting, and other high-draw accessories, it delivers stable voltage under load where factory charging systems fall short.
Built in the USA using premium components, this alternator is designed for continuous high-amperage output with reliability as the priority. Strong idle output and a broad usable RPM range help maintain voltage stability during real-world driving conditions, not just at peak engine speeds. Each unit is hand-assembled and tested to ensure consistent performance and long service life.
Like most high-output alternators, this unit is equipped with a smaller overdrive pulley to help maintain maximum output at idle and will typically require a belt that is 1/2 inch to 1 inch shorter than the factory belt to achieve proper belt tension.
To simplify installation, the alternator includes a dedicated adapter plug. One side connects directly to the alternator, while the opposite side plugs into the factory vehicle harness, allowing for a clean, plug-and-play electrical connection without modification to the OEM wiring.
Features include:
- 400 amps of peak output for extreme electrical demand
- Strong idle output and improved voltage stability under load
- Overdrive pulley included to enhance low-RPM performance
- Plug-and-play adapter harness included for direct factory connection
- Heavy-duty internal components designed for sustained high-current operation
- Direct-fit design for select Nissan applications
- Ideal for high-power audio systems, off-road accessories, lighting, and auxiliary power needs
For Nissan owners pushing serious electrical loads, this Mechman 400-amp alternator delivers dependable, high-output charging performance built for both daily use and demanding environments.
Installation Notes:
This unit comes equipped with a smaller 1.75-inch diameter alternator pulley and will require a slightly shorter drive belt for proper belt tension. Not recommended for sustained use above 5,000 RPM engine speed. If a larger pulley is required, please reach out to Mechman’s support team and we can work to get you an underdrive pulley to meet your RPM demands.
