PRODUCT DESCRIPTION
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
*Attention!* Nissan Titan Owners
The 2007 Nissan Titan had a mid-year change where two different alternators were used. Please reference the image and verify that the regulator plug matches your factory alternator before ordering.
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.
Fitment Table | B11120400M – Plug Code: 300
| Make / Model | Year | Engine Size |
|---|---|---|
| Infiniti QX56 | 2004-2006 | 5.6L V8 |
| Nissan Armada | 2005-2006 | 5.6L V8 |
| Nissan Pathfinder | 2004 | 5.6L V8 |
| Nissan Titan | 2004-2007 | 5.6L V8 |
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.
Specifications
- Fitment Type Performance/Custom
- Manufacturer Part Number B11120400M
- California Prop 65 Warning WARNING: This product contains chemicals known to the State of California to cause cancer or birth defects or other. For more information, go to www.P65Warnings.ca.gov.
- Brand Mechman High Output Alternators
- Type Alternator
- Interchange Part Number High Output Alternator, Aftermarket Upgrade, Heavy Duty Stronger, Bolt On Direct Replacement Durable, Superior Design, Charge Charging Charged Batteries Battery, High Amperage
- Manufacturer Warranty 2 Year
- Features Clockwise Rotation, Pulley Included
- Universal Fitment No
- Finish Billet Aluminum
- Country of Origin United States
Lease-2-Own Options
Acima (Text 40715 to number: 22462 to apply)
We have been working closely with Mechman alternators for over 10 yrs on cataloging, photographing, and marketing for the Mechman brand. I can confidently say, No one knows the Mechman Brand as well as we do. We stock all their top selling part numbers, and have an excellent working knowledge of their products & SKU’s. Mechman is the best in their given profession. They provide one of the industries top product warranty (2 years), and have the best tech team available to trouble shoot any installation issues you may have. Mechman has one of the shortest lead-times on their custom built high output alternators (if we don't have it in stock). All of these reasons have lead to our dedication to sell only the best alternators! Mechman.
~Alternator Outlet
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Lease-2-Own Options: Acima (Text 40715 to number: 22462 to apply)
AlternatorOutlet is one of eBay's most reputable sellers. Consistently delivers outstanding customer service
We ship via UPS Ground. Order tracking information will be provided once the item has shipped.
Alternators carrry a 3-5 day leadtime before shipping.
All other items in our store ship within 1 business day.
Delivery estimate is typically 3-5 business days for alternators for domestic only.
All items must be returned in the same condition it was received. Returns are processed within 7-10 business days upon return delivery date. Refunds are less the cost of the originally purchased shipping. Any item that is returned after 45 days will have a 20% restocking fee applied.
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This includes a commitment to excellent customer service, even after your order has been delivered.
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