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A 20a alternator is a type of alternator that generates 20 amps of current. It is often used in cars with basic electrical needs or used as a backup for bigger alternators. There are different types of 20a alternators that suit various applications. They include:
20a One Wire Alternator:
It is called a one-wire alternator because it only requires one wire to connect to the gauge. The wire runs to the positive side of the battery. The 20a one-wire alternator is easy to install and use. It is commonly used in tractors, classic cars, and trucks that don't have a complex electrical system.
20a Delco Alternator:
The 20a Delco alternator is a popular aftermarket alternator. It is used in a variety of vehicles after some modifications. The 20a Delco alternator has a case size and design that makes it suitable for most vehicle applications. It is reliable and has a long service life.
20a 6v Alternator:
The 20a 6v alternator is designed for use in vintage cars and trucks that have a 6v electrical system. It converts mechanical energy into electrical energy. The 20a 6v alternator helps to recharge batteries and power electrical equipment in vehicles.
20a 12v High-Output Alternator:
The 20a 12v high-output alternator is designed for use in vehicles that have many electrical components. For instance, it can be used in cars that have high-output sound systems, lighting systems, or other major electrical accessories. The alternator generates a consistent and stable 12v power supply to run all the electrical equipment.
Brushless 20a alternator:
The brushless 20a alternator doesn't use brushes to transmit current. Instead, it uses electronic controllers to send current to the rotor windings. This reduces maintenance costs and increases the lifespan of the alternator. The brushless 20a alternator is very efficient.
The specifications of any given 20 amp alternator are important to understand as they help one know what to expect in terms of performance and capacity.
Voltage Output
The primary purpose of an alternator is to produce electric power to run the electrical systems and recharge the battery. The voltage output of a 20 amp alternator is usually 12 to 14 volts. This output can be used to power small electrical gadgets like GPS and charge batteries. However, if one needs to use several electrical components, it is advisable to look for a higher-rated alternator.
Current Output
The current output of a 20 amp alternator is 20 amps, as the name suggests. This current is enough to charge a small 12-volt battery in 5 to 6 hours. The charging time will vary depending on the battery size and its state of charge. Generally, a 20 amp alternator is used for light applications like powering a small audio system or running LED lights. For heavy applications like electric vehicles or large sound systems, a higher-rated alternator is recommended.
Speed
Speed is another important specification of the 20 amp alternator. The alternator spins at 2,000 to 6,000 RPM (revolutions per minute) when the engine is running. This speed allows the alternator to produce enough electricity to power electrical systems and charge the battery. However, the alternator can be noisy when it spins at high speeds.
Size
A 20 amp alternator is small and portable. The dimensions and weight of a 20 amp alternator vary depending on the manufacturer. However, it is roughly 6 inches in diameter and 10 inches long. The weight is around 5 to 15 pounds. This makes it suitable for applications such as portable generators and wind turbines.
Type
There are different types of alternators, each with its advantages and disadvantages. The 20 amp alternator is a brushless alternator. It is more efficient, has a longer lifespan, and requires little maintenance. This type of alternator is mostly used in applications that require a constant and reliable power source.
20a alternators have different specifications, and thus they require different maintenance to keep them in good working condition. Here are some general tips:
Wholesale buyers should consider the following factors when purchasing any 20a alternator.
Compatibility
Ensure the alternator is compatible with the target vehicle's specifications. Check the make, model, and year of the car or truck to ensure that the alternator is designed for use in that vehicle. Additionally, buyers should verify the engine type, such as gas or diesel, and any special modifications or components present in the vehicle.
Quality and Reliability
Buyers should focus on high-quality alternators from reliable suppliers. Such alternators offer consistent performance and durability. They source alternators from reputable brands and manufacturers known for producing quality parts. Furthermore, buyers can read online reviews and ratings to gauge the experiences of other customers with the alternator's quality and reliability.
Warranty and Support
Buyers should consider the warranty length and coverage offered by the alternator supplier. A good warranty is a sign of faith in the product's quality and performance. Additionally, buyers should consider the type of customer support offered by the supplier. Prompt and reliable customer support can assist in resolving any issues or inquiries related to the alternator.
Installation and Maintenance
Buyers should consider the alternator's ease of installation and maintenance requirements. Some alternators may need special tools or advanced mechanical skills for installation. Buyers should select alternators with straightforward installation processes or consider the availability of installation guides or videos. Additionally, buyers should check the alternator's maintenance requirements, such as recommended intervals for belt tension adjustments or lubrication.
Price
Buyers should select alternators that fit their budget and offer the best value for money. They should not go for extremely low-priced alternators, as they may be of poor quality or need more durability. Additionally, buyers should compare the features and benefits of different alternators to ensure they get the best deal.
In order to DIY and replace the 20A alternator, follow the simple step-by-step guide below:
Safety Precautions:
Turn off the engine and engage the parking brake. Wear gloves and safety glasses, and ensure the work area is well-ventilated.
Gathering Tools:
Wrenches and sockets, Ratchet, Pliers, Screwdrivers, Torque wrench, Belt tensioner tool, and New 20A alternator.
Disconnecting the Battery:
Start by disconnecting the negative (-) battery cable from the battery, followed by the positive (+) cable.
Removing the Serpentine Belt:
Use a belt tensioner tool or a wrench on the tensioner pulley to relieve tension and slide the serpentine belt off the alternator pulley.
Disconnecting Electrical Connections:
Remove the alternator's electrical connections, including the battery wire (usually a nut/bolt connection) and the signal wire (may be a plug-in connection).
Removing the Mounting Bolts:
Use a wrench or socket to remove the alternator mounting bolts. The number and location of bolts may vary depending on the vehicle's make and model.
Alternator Removal:
Carefully slide the alternator out of its mounting location and detach it from any brackets or supports.
New Alternator Installation:
Position the new 20A alternator in the mounting location and secure it to the brackets or supports. Install the mounting bolts and tighten them to the manufacturer's torque specifications.
Electrical Connections:
Reconnect the electrical connections to the new alternator, ensuring they are secure and properly insulated.
Serpentine Belt Installation:
Place the serpentine belt onto the new alternator pulley, following the correct routing diagram (usually found on a sticker near the belt or in the owner's manual).
Reconnect the Battery:
Reattach the positive (+) battery cable to the alternator and secure it, followed by the negative (-) cable to the battery.
Engine Start and Testing:
Start the engine and ensure the alternator functions. Verify that the serpentine belt is correctly aligned and tensioned.
Q1: Can a 20A alternator be used in heavy-duty applications?
A1: No, a 20A alternator is not suitable for heavy-duty applications such as commercial trucks or heavy towing. These applications require high-output alternators to meet their power demands.
Q2: Can a 20A alternator be installed in any vehicle?
A2: A 20A alternator can be installed in any vehicle, but it is most commonly found in small or older vehicles. For newer or larger vehicles, a 20A alternator may not provide sufficient power.
Q3: What is the expected lifespan of a 20A alternator?
A3: The lifespan of a 20A alternator can vary based on its usage and maintenance. On average, it can last between 5 to 7 years. However, factors like extreme weather conditions, heavy electrical loads, and infrequent maintenance can affect its longevity.
Q4: Can a 20A alternator be upgraded to a higher capacity?
A4: Yes, a 20A alternator can be upgraded to a higher capacity. This is especially useful for vehicles with added accessories like sound systems, off-road lights, etc. Upgrading to a high-output alternator can compensate for the increased electrical load.
Q5: Does the size of a 20A alternator vary?
A5: Yes, the size of a 20A alternator can vary based on the model and manufacturer. Generally, it is smaller and lighter than high-output alternators. However, physical dimensions are not the only factor to consider when selecting an alternator.
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