55 Amp Alternator – Fits MerCruiser V6 and V8 Sterndrives and Inboards (Replaces 807652T)
55 Amp Alternator – Fits MerCruiser V6 and V8 Sterndrives and Inboards (Replaces 807652T) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
55 Amp Alternator – Fits MerCruiser V6 and V8 Sterndrives and Inboa...
Product Details
This 55 Amp Alternator – Fits MerCruiser V6 and V8 Sterndrives and Inboards (Replaces 807652T) is designed for General Motors-built MerCruiser V6 (262 CID) and V8 (305 & 350 CID) sterndrive or inboard engines from 1996 through 1999 that use a serpentine belt drive system.
It serves as a direct replacement for Mercury/Quicksilver 807652T, Sierra 18-5967, and ARCO 60055, ensuring reliable performance and fitment.
- Installs on engines using a multi-groove serpentine pulley system.
- Features a 2-inch mounting foot for secure attachment.
- Provides a 55 Amp, 12 Volt electrical output with an internal regulator.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury / Quicksilver | 807652T |
| Sierra | 18-5967 |
| ARCO | 60055 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is designed for specific MerCruiser sterndrive and inboard engine models. Check your engine's serial number against the ranges provided to ensure an exact match.
| Brand | Model | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| MerCruiser | 4.3L (GEN+) (2 BBL.) GM 262 V-6 | 4-Stroke | 1998 | 807652T | Serial 0L010044–0M614999 |
| MerCruiser | 4.3LH (GEN+) (4 BBL.) GM 262 V-6 | 4-Stroke | 1998 | 807652T | Serial 0L010044–0M614999 |
| MerCruiser | 4.3LX (GEN+) (2 BBL.) GM 262 V-6 | 4-Stroke | 1996–1997 | 807652T | Serial 0F803000–0K999999 |
| MerCruiser | 4.3LXH (GEN+) (4 BBL.) GM 262 V-6 | 4-Stroke | 1996–1997 | 807652T | Serial 0F803114–0K999999 |
| MerCruiser | 5.0L (2 BBL.) GM 305 V-8 | 4-Stroke | 1998–2001 | 807652T | Serial 0L015751–0M599999 |
| MerCruiser | 5.7L (2 BBL.) GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K001527–0K999999 |
| MerCruiser | 5.7L (2 BBL.) GM 350 V-8 | 4-Stroke | 1998–2001 | 807652T | Serial 0L010037–0M599999 |
| MerCruiser | 5.7L CARB MIE | 4-Stroke | 1998 | 807652T | Serial 0L002003–0M316999 |
| MerCruiser | 5.7L MIE GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K040307–0K999999 |
| MerCruiser | 5.7LX (4 BBL) GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K001527–0K999999 |
| MerCruiser | 350 MAG (SKI) GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K040400–0K999999 |
| MerCruiser | 350 MAG. ALPHA (4 BBL.) GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K001527–0K999999 |
| MerCruiser | 5.7L COMPETITION SKI GM 350 V-8 | 4-Stroke | 1997 | 807652T | Serial 0K040004–0K999999 |
| MerCruiser | 5.7L COMPETITION SKI (GEN+) GM 350 V-8 | 4-Stroke | 1998 | 807652T | Serial 0L002005–0M316999 |
| MerCruiser | 357 Alpha 4V | 4-Stroke | 807652T | Serial 1G400000 & Up | |
| MerCruiser | 357 Mag Bravo 4V | 4-Stroke | 807652T | Serial 1G400000 & Up | |
| MerCruiser | 383 Mag Bravo 4V | 4-Stroke | 807652T | Serial 1G480748 & Up |
Technical Specs
- Product Type
- 55 Amp Alternator
- Installation
- Serpentine Belt System
- Connection
- Multi-groove Serpentine Pulley
- Dimensions
- 19.0 × 18.5 × 20.5 cm (7.5 × 7.3 × 8.1 inches)
- Weight
- 4.08 kg (9 lbs)
- Mounting Foot
- 2-inch
- Electrical Output
- 55 Amp
- Voltage
- 12 Volt
- Regulator
- Internal
- Warranty
- 1 year
What’s in the Box
- 1 x 55 Amp Alternator Assembly
Installation Notes
- Disconnect the battery terminals, starting with the negative cable.
- Loosen the serpentine belt tensioner and remove the belt from the alternator pulley.
- Disconnect the main power wire and the field wire connector from the old alternator.
- Remove the alternator mounting bolts and carefully lift the old unit out of the engine bay.
- Install the new alternator, ensuring the mounting foot is correctly seated. Secure it with the mounting bolts.
- Reconnect the power and field wire connectors to the new unit.
- Route the serpentine belt over the new alternator pulley and re-apply tension.
- Reconnect the battery terminals, starting with the positive cable.
- Start the engine and verify the alternator is charging correctly using a voltmeter.
Troubleshooting & FAQ
How do I know if my alternator is failing?
Common signs include dimming lights, a warning light on the dashboard, a weak or dead battery, frequent need for jump-starts, or a whining/grinding noise coming from the engine bay. You can test the voltage at the battery with the engine running; it should be between 13.5 and 14.5 volts.
Will this fit engines outside the 1996–1999 year range?
This alternator is specifically designed for the model years listed. Using it on other engines is not recommended, as fitment, wiring, and pulley alignment may differ, potentially causing damage.
What is the difference between this aftermarket alternator and an OEM part?
Our aftermarket alternator is built to match OEM specifications for performance and fit. While it is not an original Mercury part, it is manufactured in an ISO 9002 facility and offers a high-quality, cost-effective alternative without sacrificing reliability.
Does this alternator come with the serpentine pulley?
Yes, the alternator assembly includes the multi-groove serpentine pulley required for installation.
What common tools are needed for this installation?
You will typically need a set of metric and/or imperial wrenches and sockets, a serpentine belt tensioner tool or breaker bar, and a wire brush for cleaning connections. Always consult a service manual for your specific engine.
How often should a marine alternator be replaced?
There is no fixed replacement interval. Alternators typically last for many years, but their lifespan can be affected by usage, exposure to moisture, and electrical load. Replace it when you notice consistent signs of failure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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