Arrowhead Alternator for Yanmar Marine Engines 12V 80A
Arrowhead Alternator for Yanmar Marine Engines 12V 80A
SKU:400-44046
In stock
Key Features
- High-quality 12V, 80A replacement alternator designed for Yanmar marine engines, ensuring dependable electrical power on board.
- Durable marine-grade construction with corrosion-resistant components for long service life in harsh saltwater environments.
- Isolated ground design suitable for marine electrical systems, preventing galvanic corrosion and electrical interference.
- Internal regulator (IR) for stable voltage output and external fan (EF) for efficient cooling under continuous operation.
- V1 pulley type ensures consistent belt grip and compatibility with standard marine drive systems.
- Reliable performance for charging batteries and powering navigation, lighting, and auxiliary systems.
- Direct-fit OEM replacement with standard R-L (Relay-Light) terminal configuration for straightforward installation.
- Tested for marine durability, vibration resistance, and consistent output under varying engine speeds.
Interchanges / Cross-References
| Brand / Manufacturer | Part Number / Code |
|---|---|
| Arrowhead | AHI0059 |
| Arrowhead (Old) | AHI0059 |
| EMP | Apr-78 |
| Hitachi | LR180-03A |
| Hitachi | LR180-03B |
| Hitachi | LR180-03C |
| Mercury Marine | 8M6007518 |
| Lester | 12272 |
| Lucas Electric | LRA01632 |
| Sierra Marine | 18-6278 |

🚚 UK Delivery: £2.99 or FREE over £75.
📦 Dispatched same-day if ordered before 3pm!
Couldn't load pickup availability
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
Share

Description
Reliable Power Solution for Yanmar Marine Engines
The Arrowhead AHI0059 Alternator is a high-performance 12V / 80A marine-grade alternator built for use with Yanmar LH series and similar marine engines. Designed to meet or exceed OEM specification, it ensures consistent, reliable power generation for marine electrical systems.
Marine-Grade Durability
Constructed with salt-resistant materials, sealed bearings, and corrosion-protected housings, this alternator withstands the harsh marine environment. Its isolated ground system prevents galvanic corrosion, making it ideal for use in fibreglass, aluminium, and steel hull vessels.
Efficient Charging and Stable Output
Equipped with an internal regulator (IR) and external fan (EF) , the alternator provides steady voltage regulation and optimal cooling during extended engine operation. The V1 pulley ensures excellent belt contact, minimising slippage and wear.
Direct OEM Replacement
This alternator features the R-L terminal configuration (Relay-Light) for quick connection to the charging system. It installs directly in place of the original unit, requiring no modifications or rewiring.
Designed for Continuous Operation
The Arrowhead marine alternator provides reliable performance under varying engine loads, ensuring uninterrupted power for navigation electronics, pumps, lights, and onboard systems. It's engineered for long service life and high vibration resistance, even in demanding commercial or leisure marine use.
OEM Cross-Reference Compatibility
The AHI0059 alternator replaces a wide range of OEM units from Hitachi, Yanmar, Mercury Marine, and other manufacturers, making it a versatile and easily sourced alternative.
More Information
Application Instructions
Specifications
Unit Type: Alternator
Part Type: UNIT
Voltage: 12V DC
Amperage: 80A
Pulley Type: V1
Rotation: Standard
Fan Type: External Fan (EF)
Regulator: Internal Regulator (IR)
Terminal Type: R-L (Relay-Light)
Ground Type: Isolated
Manufacturer Code: AHI0059
OEM References: LR180-03A / LR180-03B / LR180-03C / K7561-61910 / 8M6007518
Housing: Marine-grade corrosion-resistant aluminium
Weight: Approx. 3.5 kg
Warranty: 12-month manufacturer’s warranty