8M0084173 8M0045112 Voltage Regulator/Rectifier for Mercury Force | JLM Marine

8M0084173 8M0045112 Voltage Regulator/Rectifier for Mercury Force | JLM MarineVoltage Regulator Rectifier for Mercury & Force Outboards 30 125 HP (8M0084173, 8M0045112) This voltage regulator rectifier is engineered for Mercury outboard motors ranging from 30 HP to 125 HP and Force outboards from 40 HP to 150 HP. Designed to maintain stable charging system performance, it ensures consistent voltage output to protect your engine's electrical components and battery. This unit directly replaces a comprehensive range of OEM part

Voltage Regulator/Rectifier for Mercury & Force Outboards – 30-125 HP (8M0084173, 8M0045112)

This voltage regulator/rectifier is engineered for Mercury outboard motors ranging from 30 HP to 125 HP and Force outboards from 40 HP to 150 HP. Designed to maintain stable charging system performance, it ensures consistent voltage output to protect your engine's electrical components and battery.

This unit directly replaces a comprehensive range of OEM part numbers including Mercury Marine 8M0084173, 8M0045112, 815279T5, 854514, 883072T, Yamaha 65W-81960-00-00, and Sierra 18-5743, providing broad aftermarket compatibility across multiple engine models and years.

• 12V operation with 14.4V set point for optimal charging performance
• Fits Mercury models from 1985–2000 and Force models from 1991–1999
• Complete plug-and-play replacement with all necessary terminals included

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

This package includes:

• 1 x Voltage Regulator Rectifier
• (The package contains all the parts shown in the picture.)

Installation Guide

1. Disconnect the negative battery cable to prevent electrical shock or short circuits.
2. Locate the existing voltage regulator/rectifier on your outboard motor, typically mounted near the powerhead.
3. Disconnect all electrical connectors from the old regulator, noting the position and color of each wire terminal.
4. Remove the mounting screws or bolts securing the old regulator to the engine.
5. Clean the mounting surface to ensure proper heat dissipation for the new regulator.
6. Position the new voltage regulator/rectifier in place and secure it with the original mounting hardware.
7. Connect each wire terminal to the corresponding connector: Gray Tach, Yellow AC, Red (Female) Sense, Red (Male) B+, Black B-, Yellow AC.
8. Double-check all connections to ensure they are tight and properly seated.
9. Reconnect the negative battery cable.
10. Start the engine and monitor the charging system voltage with a multimeter; it should read approximately 14.4V at idle.
11. Run the engine at various RPMs to confirm stable voltage regulation.
12. Inspect all connections after the test run to ensure no loose or corroded terminals.

Troubleshooting & FAQ

Q: How do I confirm this regulator fits my Mercury or Force engine?
A: Cross-reference your engine's horsepower, year, and serial number with the compatibility table above. You can also verify your original part number against the part number cross-reference list to ensure a match.

Q: What are the signs that my voltage regulator/rectifier is failing?
A: Common symptoms include dimming lights, erratic instrument readings, battery not charging properly, or voltage exceeding 15V which can damage electrical components. If you observe these issues, test the charging voltage and inspect the regulator.

Q: How often should I replace the voltage regulator/rectifier?
A: Voltage regulators typically last many years under normal conditions. Replace it when you experience charging system failures, visible corrosion on terminals, or if it fails voltage output tests. Routine inspection during annual maintenance is recommended.

Q: Can I install this regulator myself or do I need a professional?
A: Installation is straightforward if you have basic mechanical skills and follow the wiring diagram carefully. Ensure all terminals are correctly matched to avoid electrical damage. Professional installation is recommended if you are unfamiliar with marine electrical systems.

Q: Is this an OEM part or an aftermarket replacement?
A: 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.

Q: How fast do you ship and how much does it cost?
A: 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.

Q: What is your warranty and return policy?
A: 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.