320 Amp alternator for Select Toyota / Lexus 4.7L and 4.3L


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Most alternators are custom built to order. Standard build time is 2-3 weeks. If you need an alternator sooner than that, please contact a sales associate to see if any in-stock options are available.
17 LBS

S Series

The S series of 6 phase alternators offers incredible output in a compact and durable package. Highly efficient, these units use less horsepower per Kw produced than conventional 3 phase alternators. 12 diodes, twin full copper rectifier plates and outstanding airflow ensure long service life, even in severe conditions. The 240-amp model offers the best balance between peak output, and output at engine idle RPM.

Installation Notes:

1.  This unit comes equipped with a smaller 1.75-inch diameter alternator pulley and will require a slightly shorter drive belt to be installed for proper belt tension.

2.  While this 320-amp alternator does make more power than our 240-amp offering, in some applications it may cause a low to no voltage output at idle.  We always recommend our 240-amp version for 95% of customers.

3.  If your vehicle does have a low or stock idle (400-600rpms), the 240 amp version is most likely your better option.  If you do not mind moving your idle up <200 rpms> or so or can rev the vehicle up while stopped the 320 create more power.  It all comes down to personal preference for the customers application.  

2 year performance guarantee.

The MechMan two year warranty applies to Mechman Alternators sold ON or AFTER 07/13/2011. This limited two year warranty allows the customer to return his or her MechMan alternator for repair for a full two years after the alternator purchase date. This warranty does not cover other parts or equipment on the vehicle, and does not cover labor for removal or installation of the alternator. This warranty is VOID if the MechMan alternator is modified, physically abused, misused, improperly installed, or is not used in the application for which it was designed. The MechMan two year warranty is non-transferrable. The customer must include a copy of the original invoice when sending in their alternator in order to receive warranty service. The customer is responsible for shipping the alternator to the Mechman facility for warranty service, Mechman will pay return shipping back to the customer for all alternators under warranty. As an added service, MechMan will also service any MechMan alternator of any age or condition for the cost of parts and return shipping. (We provide the labor to repair the alternator for free!)

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  • 5

    AJ | 10th May 2024

    This thing is a UNIT! 6k RMS and 400Ah of battery reserve barely make this thing break a sweat @ 1800rpm. I will say at IDLE, my Sequoia is running on battery when it drops to ~550 rpm. That’s normal behavior for High Output alternators and this model Toyota. I recommend a beefy battery bank and stout electrical for daily application. I wouldn’t recommend this one for demo purposes. Get the 240– you’ll thank me later.