SKU: 53068632852

804278A12 804278T11 Regulator Rectifier for Mercury Yamaha F75 F80 F90 F100 | JLM Marine

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Description

804278A12 804278T11 Regulator Rectifier for Mercury Yamaha F75 F80 F90 F100 | JLM MarineRegulator Rectifier for Mercury Yamaha F75 F80 F90 F100 Outboard Motors This aftermarket Voltage Regulator Rectifier is designed as a direct replacement for Mercury 75 90 HP 4 Stroke outboards (2000 2005) and Yamaha F75, F80, F90, and F100 4 Stroke models (1999 2004). Engineered to match OEM specifications, it ensures reliable voltage regulation and charging performance across a broad range of mid power outboard applications. This unit directly

Regulator Rectifier for Mercury Yamaha F75 F80 F90 F100 Outboard Motors

This aftermarket Voltage Regulator Rectifier is designed as a direct replacement for Mercury 75-90 HP 4-Stroke outboards (2000-2005) and Yamaha F75, F80, F90, and F100 4-Stroke models (1999-2004). Engineered to match OEM specifications, it ensures reliable voltage regulation and charging performance across a broad range of mid-power outboard applications.

This unit directly replaces Mercury OEM part numbers 804278A12, 804278T11, 804278T12, and 804278T, as well as Yamaha part numbers 67F-81960-10, 67F-81960-11, 67F-81960-12, and 67F-81960-00.

  • Plug-and-play design with no assembly required—direct fit for quick installation
  • Features improved heat sink design and higher-grade electrical components for enhanced durability
  • Each unit is factory-tested before shipping to ensure reliable performance

Part Number Cross-Reference

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

Brand Part Number
Mercury 804278A12
Mercury 804278T11
Mercury 804278T12
Mercury 804278T
Yamaha 67F-81960-10
Yamaha 67F-81960-11
Yamaha 67F-81960-12
Yamaha 67F-81960-00

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.

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.

Brand Model Stroke Years
Mercury F75 4-Stroke 2000-2005
Mercury F90 4-Stroke 2000-2005
Yamaha F100A ETL/X 4-Stroke 1999-2001
Yamaha F100 TL/XR 4-Stroke 1999-2003
Yamaha F100 TLR 4-Stroke 1999-2003
Yamaha F100 TXR 4-Stroke 1999-2003
Yamaha F90A ETL/X 4-Stroke 2003
Yamaha F90 TL/XR 4-Stroke 2003-2004
Yamaha F90 TJR 4-Stroke 2003-2004
Yamaha F90 TLR 4-Stroke 2003-2004
Yamaha F80A ETL/X 4-Stroke 1999-2001
Yamaha F80 TL/XR 4-Stroke 1999-2003
Yamaha F80 TJR 4-Stroke 2002-2003
Yamaha F80 TLR 4-Stroke 2000-2003
Yamaha F80 TXR 4-Stroke 1999-2000
Yamaha F75 TLR 4-Stroke 2003-2004
Yamaha F75A ETL 4-Stroke 2003

Technical Specifications

Specification Value
Condition Aftermarket 100% Brand New
Type Voltage Regulator Rectifier
Quantity 1 PC
Length 82 mm / 3.21 inches
Width 62 mm / 2.43 inches
Height 30 mm / 1.18 inches
Fixation Holes Distance 65 mm / 2.58 inches
Number of Plug Interface Pins 3
Number of Plugs 4
Number of Wires 6

Package Contents

  • 1 × Voltage Regulator Rectifier

Note: The package contains all the parts shown in the picture.

Installation Guide

  1. Disconnect the battery and ensure the ignition is off before beginning installation.
  2. Locate the existing regulator rectifier on your outboard motor, typically mounted near the engine's electrical system.
  3. Disconnect all wiring harness connectors from the old regulator rectifier. Take note of the connector positions or take a photo for reference.
  4. Remove the mounting bolts securing the old unit to the engine bracket.
  5. Position the new regulator rectifier in the same location and align the mounting holes.
  6. Secure the new unit with the original mounting bolts, ensuring a snug fit without over-tightening.
  7. Connect each wiring harness plug to the corresponding socket on the new regulator rectifier. The connectors are keyed to prevent incorrect installation.
  8. Double-check all electrical connections to ensure they are fully seated and secure.
  9. Reconnect the battery, ensuring correct polarity (positive to positive, negative to negative).
  10. Start the engine and verify that the charging system is functioning properly by checking the battery voltage with a multimeter (should read approximately 13.5–14.5 volts at idle).
  11. Inspect the regulator rectifier for excessive heat after a short test run; it should warm but not become excessively hot.
  12. If any issues arise, immediately shut down the engine and recheck all connections and mounting points.

Troubleshooting & FAQ

Q: How do I confirm this regulator rectifier fits my specific engine?
A: Cross-reference your engine's model, year, and OEM part number with our compatibility table above. You can also check your engine's serial number using the guides provided or consult your engine's parts diagram to verify the exact part number currently installed.

Q: What are the signs that my regulator rectifier is failing?
A: Common symptoms include a dead or undercharged battery, dimming lights at idle, erratic electrical system behavior, or the battery overheating. If you measure voltage output above 15 volts or below 13 volts while the engine is running, the regulator rectifier may be faulty.

Q: How often should I replace the regulator rectifier?
A: Regulator rectifiers typically last several years under normal operating conditions. Replace it if you experience charging system issues, visible corrosion, or heat damage. Regular electrical system inspections during annual maintenance can help catch problems early.

Q: What's the difference between this aftermarket part and the OEM version?
A: This aftermarket unit is built to match OEM specifications and dimensions. It features higher-grade electrical components and an improved heat sink design for enhanced durability and charging performance, often at a more competitive price point than OEM parts.

Q: Can I install this myself, or do I need a professional?
A: Installation is straightforward for those with basic mechanical skills and familiarity with outboard electrical systems. The plug-and-play design simplifies the process. However, if you're uncomfortable working with electrical systems, we recommend professional installation to ensure safety and optimal performance.

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 53068632852

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AmazinFrank
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★★★★★ 5
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Very good sound deadener and heat shield, it is a bit sticky to work with, but easy to shape and cut
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Reviewed in the United States on April 19, 2026
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Model: SLH20025, Model: SLH20025
I have installed all kinds of insulation in vehicles over many years. I only needed to purchase 2 boxes to complete the entire interior siding of my 2025 chevy express, what a great value! I wanted to insulate my locksmith van for sound and heat. The sound reduction virtually eliminated the road noise. These panels also look amazing. It got up to 110F in the sun with the doors closed. After adding Siless insulation the temperature maxed out at 97F. That is a massive difference. Plus, I didn't even finish with the roof before testing. Siless Hybrid 3in1 was extremely easy to cut and adhere onto metal panels. I'm impressed with the quality of the individual panels and the adhesive is not toxic smelling compared to some others. My favorite thing about these panels is you can actually take them off and readjust them before they finally stick and they do not leave any black residue behind when you pull them up to adjust them. All I needed was a heat gun, knife and a roller to complete this job. The size of each panel is perfect, you can handle them with ease. I probably won't need your product again for a while, but when I do I will definitely be back.
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Reviewed in the United States on September 21, 2025
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Mark Kadrich
Belleville, US
★★★★★ 5
Works well and is easy to install.
Model: SLH20025, Model: SLH20025
I was sound and heat insulating a generator bay in my class A RV so I did three tests before and during material application: I did a sound level test to see how effective the material was for my application, a "stickiness" test, and a flammability test. This was indoors on a dry 78°F day. From beginning to end, the entire process, including testing, took 5 hours to install 25 sqft or material in a very complex area. One hour for cleaning, 3 hours for installation, and 1 hour for test setup and testing. Using a sound meter, I took before and after readings and determined that I reduced the sound level by 2.2 db (40% energy decrease) with a noticeable decrease in sound and frequency. The generator bay is located under the master bedroom in the aft portion of the coach. The sound went from a rattling, vibrating generator noise to a more tolerable low level rumble. The material was easy to apply. I did some testing prior to application and determined that surface preparation is key. I cleaned my painted metal surface and then degreased with acetone and the material stuck well. Be careful and purposeful when you apply the material because once it was stuck to the metal, it was quite difficult to remove or reposition. Since it was going to be installed into a gasoline powered generator bay located under our sleeping quarters, I did some flame testing to determine the level of risk. Although not highly flammable after installation, my testing revealed that the PE used will catch on fire under certain circumstances. In order to reduce the risk, I used aluminized duct tape to ensure that all the edges were sealed and the PE was not exposed to direct flame in the event of a fire. I also decided to install an automatic fire extinguisher as an added precaution. In all fairness there should be one installed in the generator bay anyway. All in all, I am very satisfied with the product and the results. I have recommended this product to my other RV owner friends.
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Reviewed in the United States on April 13, 2025
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Josh
Omaha, US
★★★★★ 5
Great product. Best value i could find
Model: SLH20025
I'm using talk to text, so forgive any grammatical and spelling errors. I ordered this product after doing a bit of research on sound dampening materials. I had been doing car stereo for quite some time since my teens. Itook a break for 20 years or so. I'm now 40 and back in the day there was dynamat. And that was about it. as irecently bought a new 2017 F350 crew cab. I wanted to put in a new stereo system and being that it was my dream truck. I was going to put in my dream stereo. But before I could do that, I needed to start with the sound deadening. I looked into today's leading product and found a company called resonx. Had taken their place as king of the hill in sound deadly. I researched their products and found the materials they were built from and Silas was the closest match at the best price I used Silas Max. First, then Silas 3 and 1 hybrid over that on all exterior panels. Then, on the interior panels. I used the 3 and 1 hybrid . on the floor I used Silas Max. Then, the 3 and 1 hybrid, then Silas liner over that the car is incredibly quiet . As far as sound dampening and deadening, it works very well for the money really can't beat it. Do your homework no How and where to apply it? And you really can't go wrong or about $400. I did. What would have cost me easily? Two thousand in other brands highly recommend the product prep work.Is everything do your homework?Do it right and you will be happy with this stuff
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Reviewed in the United States on May 6, 2026
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william scott
Omaha, US
★★★★★ 4
Not simple, nor easy
Model: SLH20025
I wanted to add sound proof material to the bare metal areas on the floor of my Toyota Tundra. The area behind the front seats had a haphazard application of sound deadening material. There were several complications to the project which may come up in other vehicles. First is the floor covering which had plastic pillars underneath to support any weight on the cover. The sound deadening material had to be cut out so these pillars would rest on the bare metal of the floor. This required a lot of cutting with a utility knife and at times heavy scissors. The instructions say to make a template before cutting the material and I did this for the driver's side. This doubled the amount of time needed to install it. On the passenger's side I laid the rectangles of material with the backing on and pressed the floor covering onto the material. This showed where the support pillars were, which I then cut out. Second is peeling the backing off the material. This can be very difficult as the adhesive sticks to it. The backing came off in multiple pieces and sometimes took 5 minutes for one piece. They say to wear gloves when handling the material but this is impossible when trying to get the backing off. Third is pressing the material onto the metal. The instructions say to use a roller, but this was impossible for the irregular surface I was working on. The hand is the best tool to press the material on. The material seems to be of high quality and I expect it will reduce the road noise in the cab.
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