Skip to product information

| Recmar

MerCruiser 3.0/V6/V8 Alternator, Ref 78403A2 | Recmar REC78403A2

REC78403A2


  • Free Shipping ✅

🚚 Dispatched in 1-3 Days

⏱️ 14 Day Return Policy

In stock

Our stock levels are updated in real time, though occasional delays may occur. If inventory appears limited and you need confirmation before ordering, our customer service team is available via live chat to verify current availability. Look for the orange chat icon in the bottom right corner of your screen.


Regular price £143.64 GBP
Sale price £143.64 GBP Regular price
Tax included. Shipping calculated at checkout.
Payment methods
  • American Express
  • Apple Pay
  • Bancontact
  • Diners Club
  • Discover
  • Google Pay
  • Klarna
  • Maestro
  • Mastercard
  • PayPal
  • Shop Pay
  • Union Pay
  • Visa
Shop safely with us

💬 Ask a question about this product

By signing up you agree to receive marketing emails and text messages. View our privacy policy and terms of service for more info.


Product Specifications and Features


This Recmar alternator is a high-quality aftermarket replacement for MerCruiser sterndrive/inboard applications using the OEM-style alternator referenced as 78403A2. It is designed for 12V charging systems and is specified by Recmar at 63A, with a single (V-belt) pulley and a self-exciting (internal) regulator.

Before ordering: fitment can vary by engine/serial number and existing alternator type. Always match your engine details and the part number stamped on the alternator currently fitted.

  • Part type: Alternator
  • Intended engine fitment: MerCruiser 3.0, V6 & V8 (V-belt/single pulley applications)
  • Electrical rating: 12V, 63A (Recmar spec)
  • Pulley: Single groove (V-belt)
  • Regulator: Self-exciting / internal regulator (Recmar spec)
  • Aftermarket reference: Recmar REC78403A2

OEM / cross-reference numbers (verify before purchase):
MerCruiser/Quicksilver: 78403A2, 78403A1, 78403, 78402, 817119A4, 817119A1, 817119R01, 92497A3, 98555A1, 8M0033842, 8M6007458, 12449A1, 90794, 881247, 889956.
OMC: 3860769, 988247.

Fitment varies by engine version. Confirm compatibility by engine model/serial number and alternator reference numbers before ordering.

Shipping Information

All orders ship from the UK. Orders placed Monday–Thursday before 12:00pm are processed same day. Orders placed Friday after 12:00pm through Sunday are processed the following Monday. Processing times vary by stock location.

Out of stock items can be back-ordered with a typical 3–4 week lead time.

If an item shows "Dispatch Available Today" and you order after 2pm UK time, processing begins the next business day.

All times are in UK BST.

Notice: Due to ongoing conflicts impacting logistics, some deliveries or re-stocking may take a little longer than expected. We're working to get your order to you as quickly as possible.

MerCruiser 3.0/V6/V8 Alternator, Ref 78403A2 | Recmar REC78403A2

£143.64 GBP

  • Largest parts catalogue in the UK

    Explore over 50,000 marine parts, all in one place.

  • Secure and safe shopping

    Your personal data is protected with SSL encryption.

  • Best prices on the internet

    We compare prices daily to ensure you get the best deal.

  • Satisfaction Guarantee

    We stand behind every product with a full satisfaction guarantee.