664-81970-62 Voltage Regulator Rectifier for Yamaha | JLM Marine

Voltage Regulator Rectifier – Fits Yamaha Outboard 9.9–55 HP (1984–1997)

This voltage regulator rectifier is engineered for Yamaha outboard motors ranging from 9.9 HP to 55 HP, covering model years 1984 through 1997. It ensures stable charging system performance by converting AC voltage from the stator to DC voltage for battery charging and electrical system operation.

This aftermarket replacement directly replaces Yamaha OEM part numbers 664-81970-62, 664-81970-61, and 664-81970-60, providing a cost-effective solution for maintaining your outboard's electrical reliability.

• Compact design: 36.9 mm length × 34 mm width
• 4-pin plug interface with 4-wire configuration
• Brand new condition, ready to install

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 Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

Your purchase includes:

• 1 × Voltage Regulator Rectifier

Installation Guide

1. Disconnect the battery: Remove the negative terminal first, then the positive terminal to ensure electrical safety.
2. Locate the existing regulator/rectifier: It is typically mounted near the engine block or under the cowling on Yamaha outboards.
3. Disconnect the wiring harness: Carefully unplug the 4-pin connector from the old regulator/rectifier.
4. Remove mounting hardware: Unbolt or unscrew the old unit from its mounting bracket.
5. Install the new regulator/rectifier: Position the new unit in the same location and secure it with the original mounting hardware.
6. Connect the wiring harness: Plug the 4-pin connector into the new regulator/rectifier, ensuring it clicks into place.
7. Reconnect the battery: Attach the positive terminal first, then the negative terminal.
8. Test the charging system: Start the engine and verify that the battery voltage increases (typically 13.5–14.5V at idle).

Troubleshooting & FAQ

Q: How do I know if my regulator/rectifier is failing?
A: Common symptoms include a dead or weak battery, flickering lights, overcharging (boiling battery), or inconsistent electrical performance. Use a multimeter to check voltage output while the engine is running.

Q: Will this fit my specific Yamaha outboard model?
A: Cross-reference your engine's horsepower and year with the compatibility table above. Also verify that your original part number matches 664-81970-62, 664-81970-61, or 664-81970-60.

Q: Can I install this myself or do I need a mechanic?
A: If you have basic mechanical skills and tools, installation is straightforward—disconnect the battery, swap the units, and reconnect. However, professional installation is recommended to ensure safety and proper electrical function.

Q: How often should I replace the voltage regulator rectifier?
A: Replace it only when symptoms of failure appear or during routine electrical system troubleshooting. There is no fixed service interval, but marine environments can accelerate corrosion and wear.

Q: What's the difference between OEM and this aftermarket part?
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.