8M0058226 Voltage Rectifier for Mercury Mariner | JLM Marine

Voltage Rectifier for Mercury Mariner Outboard – Fits 1976-1998 Models 6-200 HP

This high-quality aftermarket voltage rectifier is designed to fit many Mercury and Mariner outboard motors manufactured between 1976 and 1998, covering a wide horsepower range from 6 HP to 200 HP. Engineered to meet OEM specifications, this rectifier ensures reliable voltage regulation and stable electrical performance for your marine engine.

This rectifier directly replaces multiple OEM part numbers including 8M0058226, 62351A1, 62351A2, 816770, 816770T, and aftermarket equivalents such as 18-5707 and 18-5707A, providing broad cross-compatibility for Mercury and Mariner outboard applications.

• 12V system – Compatible with standard Mercury/Mariner electrical systems
• Compact design – Measures approximately 40mm × 40mm × 23mm for easy installation
• 100% brand new – Factory-fresh condition with full performance guarantee

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands:

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

Your package includes:

• 1 × Voltage Regulator Rectifier

Note: The package contains all the parts shown in the product images.

Installation Guide

1. Disconnect the battery: Always disconnect the negative terminal first to prevent electrical shorts or sparks.
2. Locate the old rectifier: Find the existing voltage rectifier on your outboard motor, typically mounted near the powerhead or electrical components.
3. Label or photograph wiring: Before disconnecting, take a photo or label each wire to ensure correct reconnection.
4. Disconnect electrical connections: Carefully remove all wire connectors from the old rectifier.
5. Remove mounting hardware: Unbolt or unscrew the old rectifier from its mounting bracket.
6. Position the new rectifier: Place the new unit in the same location, ensuring proper alignment with mounting holes.
7. Secure with fasteners: Tighten mounting bolts or screws to manufacturer specifications; do not over-tighten.
8. Reconnect wiring: Attach each wire connector to the corresponding terminal on the new rectifier, referencing your labels or photos.
9. Check all connections: Verify that all wires are firmly seated and no terminals are exposed or touching metal.
10. Reconnect the battery: Attach the positive terminal first, then the negative terminal.
11. Test electrical system: Start the engine and verify that the charging system operates correctly; check voltage output with a multimeter if available.
12. Inspect for issues: Look for any signs of overheating, loose connections, or unusual behavior during initial operation.

Troubleshooting & FAQ

How do I confirm this rectifier fits my Mercury or Mariner outboard?
Verify your engine's horsepower (6-200 HP) and year (1976-1998) against the compatibility table above. Cross-reference your existing part number with the list provided (8M0058226, 62351A1, 62351A2, 816770, 816770T, 18-5707, etc.). If your original part matches any listed number, this rectifier will fit.

What are the signs that my voltage rectifier is failing?
Common symptoms include battery not charging, battery draining quickly, dim or flickering lights, erratic gauge readings, or the engine dying after startup. If you measure abnormal voltage output (significantly above or below 13.5-14.5V at cruising RPM), the rectifier may be defective.

How often should I replace the voltage rectifier?
Rectifiers typically last several years under normal use, but replacement intervals vary based on operating conditions, electrical load, and exposure to moisture or corrosion. Inspect annually and replace immediately if you notice charging issues or physical damage.

What is the difference between this aftermarket rectifier and the OEM part?
This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

How fast do you ship and how much does it cost?
We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

What is your warranty and return policy?
This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.