Mercury Charging & Electrical Components

Mercury Marine Engine Charging and Electrical Components Resources and Information

PartsVu is happy to stock a wide selection of certified Mercury outboard charging and electrical components to fit the exact specifications of your Mercury outboard motor. The charging system of any Mercury outboard has three main components: the alternator, the voltage regulator, and the batteries. Properly maintaining these components is crucial to keeping your Mercury outboard functioning properly. 

We also offer helpful resources to help you maintain your Mercury outboard motor, such as:

• Mercury Outboard Specs & Capacities Chart
• Mercury Outboard Serial Number Lookup
• Mercury Outboard 100-hour Service Guides

Mercury Outboard Charging and Electrical Components FAQs

How do I start my Mercury outboard engine? 

Mercury makes a 2-stroke and 4-stroke engine. The 4-stroke engines have risen in popularity due to their reduced noise, fuel efficiency, and greater longevity. Because they’ve grown in popularity in recent years, most of them tend to be newer. Typically, they’re as easy to start as tilting them down and turning the key. 

In contrast, a carbureted 2-stroke may not be as simple to start.

1. First, tilt the engine so that the fuel can more easily reach the carburetor
2. Prime the bulb until it’s too hard to squeeze
3. While in neutral, advance the throttle to ⅔
4. Turn the key, push to choke and crank
5. Release the choke and return to neutral

How do I manually start an electric start outboard engine? 

If the engine is under 25HP, you shouldn’t have too much trouble removing the cowl cover and using the emergency cord to pull-start. This is generally possible for engines up to 50HP, but it will be increasingly difficult the higher the horsepower. To do this:

1. Ensure that the key is in the on position and that the shift is in neutral 
2. If you’re using a rope, tie a knot so that the rope can be secured in the notch in the flywheel
3. Wrap the rope around the flywheel in the correct direction for your engine, which is most likely clockwise
4. Pull repeatedly until the engine starts
5. Put the cowling back on once the flywheel stops spinning

If this doesn’t solve your problem, you may need to go through a more thorough troubleshooting process. Our guide, Why Your Mercury Outboard Motor Stopped Working, outlines everything you’ll need to check in greater detail, with handy flowcharts for reference.

Why did my Mercury outboard motor stop working?

Your Mercury outboard ignition system is responsible for firing up the engine and keeping it running. Because checking this system may involve sparks and heat, keep flammable liquids away. 

The first part of the ignition system to check is the spark plugs. Clean and adjust the spark plugs– they may need to be replaced. Learn what to look for and how to perform spark plug replacement with our comprehensive guide.

Check the ignition spark with a spark gap tester. If you’ve got a good spark, make sure that the air gap is within specification. Adjust it if needed. If you have a good spark and the gap is within specification, the problem will likely not be found in the ignition system.

However, if you don’t have a good spark, salt buildup on the spark plug caps or ignition coil leads could be causing problems. You’ll also need to check both the spark plug caps and ignition coil leads for proper resistance. Replace degraded parts. When there is no salt buildup and both parts have proper resistance, check the ECM output peak voltage.

If your spark plugs don’t seem to be the issue, check that the electric oil pump and oil level sensor are in good condition. If so, check the reed valve for its condition.

How do I check the hours on my Mercury outboard motor?

To access a Mercury outboard’s computer memory, you will need to visit an authorized Mercury outboard dealer. The dealer will have the necessary computer software and the cable to plug the shop’s laptop into your outboard.

A dealer might charge you for 30 minutes or so of labor to run a diagnostic scan, but if you are buying a used Mercury outboard motor, this investment is well worth it. However, if you are negotiating to buy the motor from a dealer, the dealer should be glad to give you a diagnostics report for no charge.

To access a Mercury outboard’s computer memory, you will need to visit an authorized Mercury outboard dealer. The dealer will have the necessary computer software and the cable to plug the shop’s laptop into your outboard.

A dealer might charge you for 30 minutes or so of labor to run a diagnostic scan, but if you are buying a used Mercury outboard, this investment is well worth it. However, if you are negotiating to buy the motor from a dealer, the dealer should be glad to give you a diagnostics report for no charge.

How many hours will a Mercury outboard last?

Why all of the discussion about Mercury outboard engine hours? The question of how many hours a Mercury outboard is expected to last is at the heart of the matter. Whether you are trying to plan how long before you probably have to buy a new outboard or working to determine the fair value for either a used outboard you are selling or considering purchasing, projecting how long engines last is critical.

The question of how long a Mercury outboard will last includes a lot of “it depends.” The reality is, a well-maintained Mercury outboard will last a long, long time. Also, even with proper maintenance, some types of engine usage are just harder on the engine. For example, if a Mercury outboard experiences long periods of wide-open throttle, extended periods of trolling, or load weight is commonly higher than recommended, service intervals need to be more frequent, and overall engine life will likely be shorter.

So, with a significant number of caveats, we’ll say that it is typical for a well-maintained Mercury outboard to last for about 3,000 – 4,000 hours of operation. But, as stated, there are so many factors influencing engine life.

Mercury outboards are extremely well-engineered engines, and we have seen many with 6,000 and even 12,000 hours on them still performing exceptionally well.

How do I troubleshoot my Mercury outboard motor?

If the kill switch isn’t properly attached it could very well be the source of your motor problems. Undo the connection and put it right back into place. The kill switch may need to be replaced altogether– read more about them here.

The next point to check is your gear shift. It’s easy to knock out of place, which prevents the engine from starting. Make sure that you’re in neutral and try starting your engine once more.

It may sound obvious, but check anyway! Is there gas in the tank? If so, is the tank vent open? A closed vent prevents air from replacing fuel as the motor pulls it out, which is necessary for firing up the engine.

Sometimes, the issues may simply be that your engine propeller has something tangled around it. This may be fishing line, excessive seaweed, or some other material that’s worked its way around the blades. Carefully remove anything that may be wrapped around the propeller, and give it a once-over for any damage that may be present. If the propeller is damaged, it needs to be replaced. Debris around the propeller is the most likely culprit if your boat motor starts, but quickly dies.

Try to start the engine both with and without using the choke. If this doesn’t work, try altering the throttle position. Applying more or less gas can sometimes do the trick. Finally, squeeze the primer bulb a few times to make sure the engine is primed up.

Some batteries have an on/off switch. If this is true for your battery, make sure the switch is on. Then, if your engine is under 25HP, you may be able to use the emergency cord to pull-start. It’s possible to do this with up to a 50HP engine, but be aware that the higher the HP, the more difficult this will be. If this works, the battery is likely the issue. You may need to replace it.

Why is my Mercury outboard not charging battery?

Is your Mercury outboard not charging the battery? There are several possible reasons why your Mercury outboard motor may not be charging the battery:

1. Faulty rectifier/regulator: The rectifier/regulator is responsible for converting AC power to DC power and regulating the charging voltage. A faulty rectifier/regulator can prevent the battery from charging.
2. Faulty stator: The stator is responsible for generating the AC power that is converted to DC power by the rectifier/regulator. A faulty stator can also prevent the battery from charging.
3. Loose or corroded connections: Loose or corroded connections can prevent the charging system from working properly.
4. Old or faulty battery: A battery that is old or has a faulty cell may not hold a charge, preventing it from charging properly.

To diagnose the issue, it is recommended to perform a voltage test on the charging system components, check the connections for tightness and corrosion, and test the battery to ensure it is functioning properly.

Does a Mercury outboard motor charge the battery?

Yes, most Mercury outboard motors have a charging system that charges the battery while the engine is running. The charging system typically consists of a stator, rectifier/regulator, and battery cables. The stator generates AC power which is converted to DC power by the rectifier/regulator, and then the DC power is used to charge the battery through the battery cables. It is important to ensure that the charging system is functioning properly to maintain a charged battery and prevent issues while out on the water. Regular maintenance and inspections can help identify any potential issues with the charging system.

What does the Mercury outboard charging system consist of?

The Mercury outboard charging system consists of a stator, rectifier/regulator, and battery. The stator is a stationary coil of wire that is mounted inside the outboard motor's flywheel. As the flywheel rotates, the magnets inside create a magnetic field that induces voltage in the stator coil. This voltage is then sent to the rectifier/regulator which converts the AC voltage from the stator to DC voltage that can be used to charge the battery. The rectifier/regulator also regulates the charging voltage to ensure that the battery is not overcharged. The battery acts as a storage device for the electrical energy produced by the charging system and is responsible for supplying power to the outboard's electrical components when the engine is not running.

How quickly can Mercury marine electrical components corrode?

The rate at which Mercury marine electrical components corrode can vary depending on a number of factors, such as the environment in which the boat is used, the frequency of use, and the quality of maintenance. Saltwater environments can be particularly harsh on electrical components, as saltwater can accelerate the corrosion process. In general, it is recommended to regularly inspect and maintain electrical components on a Mercury outboard motor to help prevent corrosion from occurring or to catch it early on. Additionally, using products such as Mercury Corrosion Guard or other anti-corrosion agents can also help to protect electrical components and extend their lifespan.

What's the safest way to troubleshoot marine electrical components and replace marine electrical parts?

When troubleshooting and replacing marine electrical components, safety should be a top priority to prevent injury and damage to the boat. Here are some general safety guidelines:

1. Turn off all electrical power to the boat before starting any work.
2. Wear appropriate personal protective equipment (PPE), such as insulated gloves and safety glasses.
3. Follow the manufacturer's instructions and recommended procedures for troubleshooting and replacing electrical components.
4. Use only marine-rated electrical components and wiring to ensure they are suitable for the marine environment.
5. Keep the work area clean and dry to prevent slips and falls.
6. Use tools that are properly insulated and rated for marine electrical work.
7. Never work alone in case of an accident or emergency.
8. If you are unsure about the task at hand, consult a professional marine electrician for assistance.

By following these safety guidelines, boaters can help ensure that they perform electrical work on their boats safely and effectively.

Are Mercury electrical problems covered by the original outboard warranty?

Mercury outboard warranties typically cover defects in materials and workmanship for a specified period of time from the date of purchase. The coverage may vary depending on the specific outboard model and warranty program chosen by the customer.

Electrical problems that are caused by defects in materials or workmanship may be covered by the original outboard warranty. However, damage caused by improper installation, operation, or maintenance may not be covered. It's important to review the warranty terms and conditions carefully to understand what is covered and what is not.

If a boater experiences electrical problems with their Mercury outboard that they believe may be covered by the warranty, they should contact a Mercury dealer or authorized service center as soon as possible. The dealer or service center can diagnose the problem and determine if it is covered by the warranty.

What are Mercury outboard charging system diagrams used for?

Mercury outboard charging system diagrams are used to illustrate the wiring and components involved in the charging system of an outboard motor. These diagrams can help boaters and mechanics troubleshoot charging system issues by identifying the different components and their connections. They can also be used to guide repairs and replacements of charging system components.

In a typical Mercury outboard charging system diagram, you will see the battery, stator, voltage regulator, rectifier, and wiring connections between these components. By following the lines and symbols in the diagram, you can understand how the charging system operates and how the different components interact with each other.

Overall, Mercury outboard charging system diagrams are an essential tool for anyone working on or troubleshooting the charging system of a Mercury outboard motor.

What are the signs of my Mercury outboard electric fuel pump failing?

There are several signs that could indicate a failing electric fuel pump in a Mercury outboard motor. Here are a few of the most common symptoms to look out for:

1. Engine won't start: If the electric fuel pump fails, the engine may not start at all, or it may start and then quickly stall.
2. Loss of power: A failing fuel pump may not provide enough fuel pressure to the engine, which can cause a loss of power and poor performance.
3. Rough running: If the fuel pump is failing, it may not be able to maintain consistent fuel pressure, which can cause the engine to run rough or misfire.
4. Engine surging: A failing fuel pump can cause the engine to surge or hesitate during acceleration.
5. Increased fuel consumption: A fuel pump that is not working properly may cause the engine to use more fuel than normal.
6. Fuel smell: A leaking fuel pump can cause a strong smell of gasoline around the motor.

If you experience any of these symptoms, it is recommended to have your Mercury outboard motor inspected by a qualified mechanic to determine if the electric fuel pump is the cause of the problem.

Which Mercury charging electrical components need to be replaced the most often?

The components of the Mercury charging system that tend to need replacement most often are the rectifier/regulator and the stator. These components can fail due to various reasons such as overheating, corrosion, or electrical overload. It is important to regularly inspect and maintain these components to ensure the charging system is functioning properly.

Where can I find Mercury electric outboard specs online?

You can find Mercury electric outboard specs on the Mercury Marine website under the "Outboards" section. Once there, select "Electric Outboards" and then choose the model of your interest. The specs for each model, including motor power, weight, battery type, and more, will be listed on the product page.

What is the new Mercury electric outboard release date for the Avator?

The Mercury Aviator electric outboard is set to launch in April 2023 and boasts features such as fast charging, low maintenance, and the ability to use GPS to adjust speed. It will be available in 11 different models ranging from 25 to 200 horsepower and will be compatible with most boat types. The electric outboard also features a modular design, making it easy to service and repair. Overall, the Aviator aims to provide a reliable and sustainable option for boaters. 

Learn more about the new Mercury electric outboard here.

Is there a way to boost my Mercury Aviator electric outboard price and resale value?

There are several things you can do to boost the price and resale value of your Mercury Avator electric outboard:

1. Regular maintenance: Keep your outboard in good condition by performing regular maintenance, including cleaning, lubricating, and replacing worn parts as necessary.
2. Upgrade features: Consider adding new features, such as a GPS navigation system or a more powerful battery, to make your outboard more appealing to potential buyers.
3. Proper storage: Store your outboard in a cool, dry place when not in use to prevent damage from the elements.
4. Proper usage: Follow the manufacturer's guidelines for usage and avoid overloading or pushing the outboard beyond its recommended limits.
5. Keep records: Keep detailed records of any repairs, maintenance, or upgrades you have made to the outboard. This will show potential buyers that you have taken good care of the outboard and can help boost its value.

Where can I learn more about Mercury Outboard Parts?

PartsVu understands that boaters want to learn how to perform their own Mercury outboard maintenance. From maintaining your Mercury outboard, Mercury sterndrive, and MerCruiser engines, there’s always something new to learn and save money. That’s why PartsVu offers our comprehensive blog, The Partsvu Xchange. 

Read up on the latest developments in boating, as well as search for everything you need to know about Mercury maintenance.

To get you off to a good start, these are some of the most important articles on Mercury Charging & Electrical Components, preparing your boat for winter storage, and more:

• How to Start a Mercury Outboard Motor
• Winterizing Mercury Outboard Motor
• Easy Step-by-Step Guide of the Most Common Boat Motor ...
• Marine Corrosion - Corrosion Types and What to Do About ...

What makes Mercury outboard electrical components degrade over time?

There are several factors that can contribute to the degradation of electrical components in Mercury outboard engines over time. One of the primary factors is exposure to the elements, such as water and salt spray, which can cause corrosion and damage to electrical connections and components. Additionally, wear and tear from normal use can cause electrical components to degrade and fail over time. Electrical components can also be damaged by improper installation or maintenance, as well as exposure to excessive heat or vibration.

How long does it take PartsVu to ship Mercury Marine Outboard Accessories, Graphics, Parts, and more?

The shipping time for Mercury Marine Outboard Accessories, Graphics, Parts, and more from PartsVu can vary depending on the shipping method chosen and the destination. Typically, orders are processed and shipped within 1-2 business days, and delivery times can range from 1-7 business days within the United States, depending on the shipping method selected. For international orders, shipping times may take longer. Customers can track their order status and shipping information through their PartsVu account.

What is Mercury outboard electric choke solenoid?

The Mercury outboard electric choke solenoid is a component in the engine's carburetor system that assists with cold starting. It is responsible for automatically controlling the choke mechanism to provide the correct air-fuel mixture during engine startup when the engine is cold. The electric choke solenoid is typically found on carbureted Mercury outboard motors.

When the engine is cold, the electric choke solenoid receives an electrical signal from the ignition switch or a control module. This signal activates the solenoid, causing it to heat up. As the solenoid heats up, it gradually opens the choke plate, allowing more air into the carburetor and adjusting the fuel mixture to the appropriate ratio for cold engine operation. This enriches the air-fuel mixture and helps the engine start and run smoothly during the warm-up phase.

The electric choke solenoid plays a crucial role in the starting and initial running of the engine, particularly in colder weather conditions. It ensures that the engine receives the right amount of fuel for efficient combustion during cold starts. Once the engine warms up, the electric choke solenoid gradually opens fully or disengages, allowing the engine to operate with the normal air-fuel mixture.