400 amp - Fits 6 & 12 CS144 - Cast case *** CUSTOM FITMENT ONLY ***


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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
Internal / 14.6-15 temperature based

This newly introduced CAST version of our already eye-catching Billet versions packs the same modern 6 phase hairpin technology but in a more budget friendly and paintable case!  Great for applications where you need the 200 amps at idle and 400+ amps at cruising but want to color coordinate or contrast your engine theme/look.

This 400-amp version will use a 46mm 9 rib pulley. We do this in order to facilitate multiple or custom fitments. This gives the customer the ultimate in adjustability for custom applications where a few mm's here and there add up to where you can achieve perfect belt alignment for adequate grip.

Since these CS144 style fitments are so popular and universal, we also include a universal adapter bolt/nut/spacer for ease of installations or variations in OEM and/or custom fabricated mounting brackets.

Please ensure you're using a high-quality belt, a very rigid alternator bracket with support and have at least an OEM amount of belt wrap to get the most of out of this high output alternator.

This alternator will come with a P101 harness that only needs a 12v key on/off source to operate. If higher than 14.8 voltage is desired, please see our wire harness section for voltage boosting plugs for easy and reliable voltage boosting up to 16+ volts.

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!)