Arrowhead Alternator for Mercury Mariner 75-115HP Outboard Engines 2001 - 2011
Arrowhead Alternator for Mercury Mariner 75-115HP Outboard Engines 2001 - 2011
SKU:400-12367
In stock
Key Features
- High-quality 12V, 50A alternator designed for Mercury and Mariner 4-stroke outboard engines (75-115HP, 2001-2011).
- Delco 5SI style alternator engineered for marine durability, providing stable charging output in harsh saltwater environments.
- Features an internal regulator (IR) and internal fan (IF) for precise voltage control and efficient cooling.
- Equipped with a 4-groove pulley (58.5mm OD) and unthreaded top mounting ear for straightforward installation on compatible outboards.
- Corrosion-resistant marine-grade construction ensures reliable operation in high-moisture and high-vibration conditions.
- Clockwise rotation for compatibility with OEM Mercury/Mariner engine configurations.
- Direct OEM replacement - no wiring modifications required.
Fits Models
- Mercury / Mariner 75HP – 115HP Outboard Engines (2001–2011)
Interchanges / Cross-References
| Brand / Manufacturer | Part Number / Code |
|---|---|
| Arrowhead (Old) | ADR0313 |
| Arrowhead | ADR0313 |
| Delco | 8400080 |
| Delco | 8400271 |
| EMP | Apr-40 |
| Lester | 8488 |
| Mercury Marine | 8M0063970 |
| Mercury Marine | 50-897755T |
| Mercury Marine | 897755T |
| Sierra Marine | 18-6840 |
| Pic | 240-6314 |

🚚 UK Delivery: £2.99 or FREE over £75.
📦 Dispatched same-day if ordered before 3pm!
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Shipping Information
Shipping Information
What Are My Shipping Options?
In-Store Pickup
In-Store pickup is available on all purchase. Pickups are available Monday - Friday between the hours of 9:00–17:00.
An email confirmation will be sent when your order is ready for collection.
Free Shipping
We offer free Standard (2-3 Days) shipping on orders within the United Kingdom on orders over £100. Please note, some large items that require specialist courier companies, such as large mirrors and palleted items are excluded from this deal.
Shipping Fees
We also offer shipping at the following rates:
Standard-Size Parcel
Standard (UK Only) - 2-3 Days - £2.99
Express (UK Only) - 1-2 Days - £4.99
International (EU) - 3-7 Days - £14.99
International (ROW) - 5-10+ Days -£23.99
Large Parcel
Standard (UK Only) - 2-3 Days - £2.99
Express (UK Only) - 1-2 Days - £4.99
International (EU) - 3-7 Days - £14.99
International (ROW) - 5-10+ Days - £69.99
Most UK orders will be sent using Royal Mail, with larger items being sent with DPD.
International orders within the EU will normally be dispatched with Royal Mail, DPD, or UPS.
International orders to the rest of the world will normally be sent with DPD or UPS.
Please note, international delivery charges are very volatile and subject to change. We will do everything in our power to honour the delivery fee, however, in some cases, shipping may increase in price. In this event, you will be given the offer to pay the difference or cancel the order and receive a full refund.
Please note, we may be subject to various rules and restrictions in relation to some international deliveries, and you may be subject to additional taxes and duties over which we have no control. If such cases apply, you are responsible for complying with the laws applicable to the country where you live and will be responsible for any such additional costs or taxes.
Dispatch Times
Orders placed before 15:00 Monday - Friday will be shipped on the same day.
Orders placed after this time will be shipped on the following business day,
Please note, we are closed at weekends, as well as English Bank Holidays.
Returns Policy
Our refund policy can be found at the following address: https://esupplyline.com/policies/refund-policy.
Further Information
You can contact us for further information on our shipping policies using the following:
Phone: 01953 711 881
Email: sales@esupplyline.com
Live Chat: Available on our website, Monday - Friday, 8:30 - 17:00.
Contact Form: https://esupplyline.com/pages/contact
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Description
OEM-Grade Marine Alternator for Mercury and Mariner Outboard Engines
The Arrowhead ADR0313 Alternator is a high-quality 12V, 50A replacement alternator for Mercury and Mariner 75-15HP 4-stroke outboards (2001 - 2011). Designed to match the performance of the Delco 5SI marine alternator, it delivers dependable power for onboard systems and battery charging.
Marine-Optimised Performance
Built for the demanding marine environment, this alternator features sealed bearings, corrosion-resistant hardware, and a marine-grade coating to protect against saltwater exposure. The internal fan (IF) ensures efficient heat dissipation, while the internal regulator (IR) provides precise voltage stability, preventing overcharging or electrical surges.
Reliable Electrical Output
Delivering a steady 50A output at 12V, this unit supports essential onboard systems such as navigation equipment, bilge pumps, lighting, and ignition electronics. The 4-groove pully (58.5,mm OD) provides excellent belt engagement and long service life.
Direct OEM Replacement
This alternator is a drop-in replacement for Mercury and Mariner OEM part numbers 897755T and 8M0063970, as well as for Delco 5SI models. It uses the same mounting points and electrical connections for easy, quick installation.
More Information
Application Instructions
Specifications
Unit Type: Alternator
Part Type: UNIT
Voltage: 12V DC
Amperage: 50A
Rotation: Clockwise (CW)
Regulator: Internal Regulator (IR)
Fan Type: Internal Fan (IF)
Pulley Type: 4-Groove (58.5mm OD)
Manufacturer: Delco 5SI Type
Mounting Ear: Top Ear Unthreaded
OEM References: 897755T / 8M0063970
Compatible Brands: Mercury Marine, Mariner, Delco, Sierra Marine
Housing Material: Marine-grade aluminium
Weight: Approx. 3.5 kg
Warranty: 12-month manufacturer’s warranty