Mercury – Quicksilver 65-Amp Alternator | For GM V6 & V8 EFI Engines (1996–1999) | 807653T

Overview

A strong charging system is the heartbeat of your boat’s electrical performance. The Mercury Marine 807653T Quicksilver 65-Amp Alternator is designed to keep your GM-built V6 and V8 EFI MerCruiser engines (305, 350, 377, 454, and 502 CID, model years 1996–1999) running smoothly. Built to handle marine conditions, this alternator delivers dependable charging power for your engine, batteries, and onboard electronics. Whether you’re cruising or trolling, it ensures steady output and consistent voltage — exactly what you expect from an OEM-quality replacement.

Key Features

• Purpose: Replaces worn or failing alternators to maintain strong, consistent battery charging.
• Output: 65 amps of reliable power for EFI engines and onboard accessories.
• Compatibility: Fits GM V6 and V8 EFI MerCruiser engines (1996–1999) with serpentine belt systems.
• Design: Built with a Mando-style alternator and serpentine pulley for precise fit and alignment.
• Performance: Tested to meet or exceed original Mercury Marine specifications.

Engine & Boat Compatibility

• GM V6 and V8 EFI engines (1996–1999) including:
• 305 CID
• 350 CID
• 377 CID
• 454 CID
• 502 CID
• For engines equipped with serpentine belt systems

Performance & Real-World Benefits

The 807653T 65-amp alternator ensures your marine electrical system stays strong under all conditions. Its 65-amp output provides steady voltage to power your electronics, charge your batteries quickly, and support your EFI system without drops or spikes.

Built for marine use, it’s sealed against moisture and resistant to corrosion and vibration — the top reasons non-marine alternators fail early. With its precise OEM fit, installation is quick and straightforward, so you can get back on the water with confidence knowing your power system is operating at peak efficiency.

Why Choose Mercury OEM

The Quicksilver 807653T is a genuine Mercury Marine alternator, engineered for your specific GM EFI setup. Aftermarket versions often fall short, with inaccurate amperage ratings or poor fitment that can lead to belt misalignment or charging issues.

Mercury OEM alternators are tested in real marine environments to guarantee proper voltage regulation, long-term durability, and corrosion resistance. It’s the same component trusted by factory technicians and professional boat builders to keep electrical systems performing reliably.

FAQ

Q1: What engines does this fit?
It fits GM-built V6 and V8 EFI engines (305, 350, 377, 454, and 502 CID) from 1996–1999 with serpentine belts.

Q2: What’s the output rating?
This alternator delivers a 65-amp output for dependable electrical performance.

Q3: Is it for marine use?
Yes — it’s marine-grade and built to resist corrosion, moisture, and vibration.

Q4: Can I install it myself?
Yes — it’s a direct OEM replacement that installs easily with basic tools.

Q5: Why OEM over aftermarket?
Because Mercury OEM alternators guarantee correct amperage, perfect pulley alignment, and long-lasting performance designed for marine environments.