Mechman 400-amp Machined Billet alternator for select Audi / VW applications

Mechman 400-amp Machined Billet alternator for select Audi / VW applications

This listing includes:

• (1) Mechman B11723400M Billet Alternator

Introducing the brand-new 100% custom billet alternator designed specifically for Audi and VW vehicles. This high-performance alternator eliminates the need for the weaker, factory-style alternator case, offering a significant upgrade with Denso-based components known for superior quality and efficiency. Built with the same internals as Mechman's signature GM Billet 400-amp alternators, this model excels in performance, aesthetics, and reliability.

This alternator delivers 200+ amps at idle and over 400 amps at driving RPMs, making it an ideal choice for those seeking to increase their vehicle's electrical output. Paired with a good battery or battery bank, it provides ample power for various automotive needs.

Installation Details:

• Charging System: The alternator uses a robust GM-style 4-pin regulator, producing a steady 14.6-14.9 volts. This regulator does not reuse the weaker OEM voltage regulator. Installation requires a simple 12V key on/off circuit connection, similar to a car audio amplifier's "remote turn on wire."


• Note: This setup may trigger a "charge battery" code, but rest assured, the alternator will charge perfectly fine.


• Idle Charging: A 46mm pulley ensures excellent charging at idle. A belt approximately †shorter than the OEM is needed. Belt size may vary based on vehicle modifications. Use the OEM spring tensioner location to verify proper fitment. Mechman offers a convenient Quick Belt Finder on their website to assist in sourcing the correct belt.


• Wiring: For optimal performance, 0-gauge power and ground wires are required from the alternator to the battery. OEM wiring can remain in place, but these additional wires ensure maximum efficiency.

Additional Notes:

• This alternator comes with a 7-rib pulley to accommodate varying mid-model year changes and retrofits. If your vehicle uses a 6-rib belt, the extra rib on the 7-rib pulley will not affect performance or cause any fitment issues.


• This custom billet alternator is the perfect upgrade for Audi and VW owners seeking improved power and reliability without compromising on quality.

Accepted Payment Methods at Big Jeff Audio

At Big Jeff Audio, we strive to make your shopping experience as smooth as possible by offering a wide variety of payment options. Below is a complete list of the payment methods we accept:

Credit and Debit Cards

• Visa
• Mastercard
• American Express
• Discover
• Diners Club

Digital Wallets

• Amazon Pay
• Apple Pay
• Meta Pay (formerly Facebook Pay)
• Google Pay
• Shop Pay
• PayPal

International Payment Methods

• Bancontact
• iDEAL

Bank Transfers

• Zelle

Financing Options

We also offer financing options to make purchasing easier. Learn more about our financing options here.

• Klarna
• Affirm
• Sezzle
• Snap
• Acima
• Tiptop

If you have any questions or need assistance with payments, feel free to reach out to us at info@bigjeffaudio.com or call us at 737-BIG-JEFF.

Shipping Options and Delivery Time

Do You Offer Expedited Shipping?

Yes! At checkout, you can select from different shipping options:

• Standard Shipping: Free for orders over $100.
• Expedited Shipping: Available at an additional cost, calculated based on the weight and destination of your order.

How Long Does Delivery Take?

• Handling Time: Most orders are processed and shipped within 1 business day after receiving cleared payment. Occasionally, additional handling time may be required, but we’ll notify you if that’s the case.
• Standard Shipping: Typically takes 3-5 business days, though delivery may be affected by extreme weather or holidays.

What Happens If My Package Is Undeliverable?

If your package is refused or marked undeliverable and returned to us by the carrier, you’ll need to pay the full shipping cost to have the package resent. Alternatively, we can refund your order, minus the cost of shipping.

Why Can’t I Track My Order?

If you're having trouble tracking your order:

• Make sure you’ve received the shipping confirmation email with the tracking number.
• Log into your account on our website and use the “Check Your Order Status” button.
• If the issue persists, please refer to our detailed guide on tracking your order or contact our customer service team for further assistance.