[For Beginners] Complete Guide to Motorcycle USB Power Installation! Specific Steps and Safety Precautions

Can I install a motorcycle USB power supply myself, or should I leave it to a specialist?

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A USB power supply is essential for connecting electronic devices such as navigation systems and grip heaters to your motorcycle, and if you have the right tools, you can install it yourself.

However, some knowledge of motorcycle structure is required, so if you usually leave maintenance to a shop or are unsure about installation, it's safer to have a shop handle it to avoid mistakes.

Those familiar with motorcycle structure and maintenance can do it themselves

Installing a USB power supply on a motorcycle requires connecting wires to the battery, which can be challenging without some knowledge of motorcycle structure. However, if you regularly perform maintenance yourself, you can install it.

The advantage of installing a USB power supply yourself is saving on installation costs compared to having a shop do it. However, installing it without wiring knowledge can lead to problems like no power supply.

Since you're dealing with electrical wiring for power, attempting to install it without knowledge of power systems can, in the worst case, lead to problems like fire or short circuits. Therefore, if you have any doubts, it's safer to ask a shop to do it.

If you're not confident with electrical wiring or motorcycle structure, it's safer to rely on a specialist shop.

If you're not confident about motorcycle structure or don't regularly perform maintenance, it's recommended to have a specialist motorcycle shop install the USB power supply.

While there will be an installation fee compared to doing it yourself, you can expect professional and reliable installation.

The estimated cost for having a specialist motorcycle shop install a USB power supply is around 5,000 to 10,000 yen for labor, plus the cost of the USB power supply unit itself.

Some specialist shops may also accommodate installations using a USB power supply you bring in, but the installation fee might be higher in such cases.

How to install a motorcycle USB power supply yourself

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If you understand the motorcycle structure for USB power supply installation, you have the option of installing it yourself, which can save on installation costs.

The steps for installing a USB power supply on a motorcycle are as follows, but if you have even a little uncertainty about the installation, it's best to ask a specialist shop to install it for you.

The common method of drawing USB power directly from a motorcycle battery is easier to install compared to other methods. However, because electricity flows constantly from the battery, it can lead to easier battery discharge.

If you ride your motorcycle less than once a week, to prevent battery discharge, either disconnect the USB power supply wiring when parked or choose a USB power supply with an on/off switch.

The steps to install a USB power supply by direct battery connection are as follows:

1. Decide on the USB power supply installation location
2. Connect the wiring to the positive and negative terminals of the battery
3. Perform a functional check

Step 1. Decide on the USB power supply installation location

First, decide on the location for installing the USB power supply (e.g., around the handlebars) and secure it so it doesn't loosen due to vibrations.

The area around the handlebars is a common location for USB power supply installation, offering convenient access at all times.

Other potential installation spots include the base of the mirror or inside the side cover, but choose a convenient location that suits the size of the USB power supply and the shape of your motorcycle.

Step 2. Connect the wiring to the positive and negative terminals of the battery

Connect the positive terminal of the USB power supply to the positive terminal of the battery, and connect the negative terminal to the negative terminal of the battery or the motorcycle's body ground.

When disconnecting battery terminals, there is a specific order: always remove the negative terminal first, then the positive terminal. Connect them in the reverse order.

The positive and negative terminals are distinguished by color: red for the positive terminal and black for the negative terminal.

The location of the motorcycle's battery varies by model; you can check its location in the service manual or on websites.

Step 3. Perform a functional check

Once the USB power supply is secured and the terminals are connected to the battery, connect an electrical device such as a smartphone or navigation system to confirm that it functions correctly.

If it doesn't operate correctly at this point, there's a connection issue. Check if the positive and negative wires are connected correctly and securely.

Once the USB power supply is functioning correctly, gather any excess wiring and secure it using zip ties or similar methods to prevent it from coming loose due to vibration or heat.

ACC power (key-linked) type USB power supply installation procedure

In addition to direct battery connection, a motorcycle USB power supply can be connected via ACC (accessory) power, which has the advantage of reducing the burden on the battery.

ACC power is linked to the motorcycle's key on/off switch; it only operates when the key is turned on, thereby reducing the risk of battery discharge compared to direct battery connection.

The procedure for connecting a USB power supply to ACC power is as follows:

1. Check the power source location
2. Check the USB power supply installation location
3. Disconnect the negative terminal of the battery
4. Split the wiring
5. Connect the USB power supply wiring and organize the wiring
6. Perform a functional check

Step 1. Check the power source location

First, locate the wiring that is energized when the key is turned on, for connecting the USB power supply.

Motorcycles from the 1990s onward typically have headlights and tail lights that are always on, so it's recommended to connect to the wiring of the headlights or tail lights.

Additionally, power can be drawn from the fuse, and since ready-made fuses with attached wiring are available, using them allows for easy power extraction without needing to split the wiring.

Step 2. Confirm the USB power supply installation location

Decide on a location to mount the USB power supply unit, such as around the handlebars or the base of the mirror, and secure it.

Some products integrate the USB power supply unit and its mounting bracket, making it easier to secure. Choose a USB power supply that fits your motorcycle and desired installation location.

Source: https://bikeman.jp/products/d-17672

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The USB power supply in the image is a product from DAYTONA that integrates the USB power supply and its mounting bracket.

Choosing a USB power supply with an integrated mounting bracket keeps the handlebar area tidy and allows for secure mounting.

• Product Name: Multibar Handle Post Clamp Short Low
• Manufacturer: DAYTONA
• Power Type: Type C
• Pipe Diameter: φ22.2
• Selling Price (incl. tax): 4,230 yen

Step 3. Disconnect the negative terminal of the battery

Once the USB power supply is temporarily secured, disconnect the negative terminal of the battery.

Disconnecting the battery's negative terminal cuts off the ground flowing to the motorcycle, preventing the risk of a short circuit, so don't forget to remove it.

Step 4. Split the wiring

If drawing power directly from existing wiring, split the wiring for the USB power supply.

Connect a branch terminal (split into two) to the wiring that is energized when the ACC is turned on (such as headlights or tail lights) to split the wiring.

Since the branched wires expose the nichrome wire inside, make sure to cover them securely with sleeves (protective material) or wrap them with electrical tape to prevent water and dust from entering.

If branching power from a fuse, replace the headlight or tail light fuse indicated on the fuse box with a branched fuse of the same amperage.

Step 5. Connect the USB power supply wiring and organize the wiring

Connect the positive terminal of the USB power supply to the branched wiring, and the negative terminal to the vehicle body or the negative terminal of the battery.

If the USB power supply cable is long, securing it along the main harness or frame will improve its appearance and reduce the risk of disconnection.

Step 6. Perform a functional check

Once the USB power supply wiring is connected, connect the battery's negative terminal and perform a functional check.

If it does not operate, check if the battery's negative terminal is connected and if the positive and negative wires are connected correctly.

Also, check if any excessive force is applied to the wiring and if the connections are secure.

Safety and precautions for installing a USB power supply on a motorcycle

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When installing a USB power supply on a motorcycle, consider the following precautions and recommended actions:

• Always include a fuse
• Ensure thorough waterproofing
• Pay attention to wiring routing
• Prevent battery discharge

Let's look at each in detail to prevent malfunctions and motorcycle issues.

Always include a fuse

A fuse is essential to protect components from overcurrent, so be sure to include one.

A fuse is a device that cuts off an electrical circuit when current exceeding its rating flows through it, protecting components from overcurrent.

The recommended fuse is 5A (amperes), with a maximum of 10A or less. If you are drawing power from an existing fuse, choose a branch fuse with the same amperage as the fuse you are drawing power from.

Ensure thorough waterproofing

Motorcycles get wet from rain and washing, so choose a USB power supply that is waterproof (IPX4 to IPX7).

Ensure that the USB power supply and the motorcycle's connection terminals, as well as the bullet connectors, are thoroughly protected from water entry with sleeves or insulating tape. Don't forget to close the rubber cap on the USB port when the USB power supply is not in use.

Pay attention to wiring routing

Wiring that is too taut or too slack can cause disconnection, so secure any excess wiring to the frame or main harness using zip ties (cable ties).

Route the wiring so that it does not come into contact with moving parts such as the handlebars, tires, or suspension, as this can cause disconnection.

Also, check if any wiring is exposed, such as at connection points, and if it is, be sure to waterproof it with electrical tape or similar.

Prevent battery discharge

Direct battery connection types remain powered even when the motorcycle engine is off. To prevent battery discharge, choose a USB power supply with a switch or install a switch.

If installing a switch is difficult, disconnect any connected electronic devices every time you finish riding.

If you don't ride for long periods, disconnecting the USB power supply wiring from the battery can reduce the load on the battery. However, if you are concerned about your battery, it is recommended to choose an ACC connection type (ACC connection type = powered only when the key is ON).

Key points when choosing a motorcycle USB power supply

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Motorcycle USB power supplies come in various types and kinds, and the specific USB power supply you choose will depend on the number of electronic devices you connect and their power consumption.

We will explain what key points to look for when choosing a motorcycle USB power supply, so please use it as a reference for your selection.

Power supply method

When choosing a motorcycle USB power supply, the most important factor is how it draws power.

USB power supplies mainly draw power in the following ways. Choose the power supply method that suits your motorcycle and usage environment.

• Direct battery connection
• ACC power type
• Cigarette lighter socket type

We will explain the characteristics of each and who they are suitable for in detail.

Direct battery connection

The direct battery connection type draws power for the USB power supply directly from the battery, characterized by its easy installation.

The direct battery connection type is suitable for people who ride their motorcycles frequently and who remove connected electrical devices when they get off the bike.

Since power is supplied to the USB power supply even when the engine is off, leaving electrical devices connected can lead to battery discharge. Therefore, it is suitable for people who remove electrical devices when they get off the motorcycle.

ACC power type

The ACC power type draws power from the electricity that flows when the motorcycle key is turned ON. When the key is turned OFF, power supply to the USB power supply also stops, which is characterized by less burden on the battery.

When connecting a USB power supply, it is necessary to branch the ACC power for connection. Therefore, it is suitable for those with some electrical knowledge of motorcycles (if installing themselves) or those who want to reduce the burden on the battery.

If you're not confident about the installation, it's best to ask a trusted professional, such as a motorcycle shop or parts shop, to install it. (Installation fee: approx. 4,000 to 12,000 yen)

Cigarette lighter socket type

The cigarette lighter socket was originally for lighting cigarettes in cars, but it is mainly used for connecting electronic devices, such as drawing power from the socket.

Having a cigarette lighter socket is a major advantage as it allows connection of various electronic devices, not just USB power supplies, but also navigation systems and dashcams.

Cigarette lighter socket type USB power supplies are suitable for those who want to swap out electronic devices or use multiple devices interchangeably.

Normally, you would need to change wiring for each electronic device you connect, but if the device is compatible with a cigarette lighter socket, you can easily swap them by connecting or disconnecting them from the socket.

Number and type of ports

A USB power supply port is a connection point (socket) for connecting electronic devices. If you only need to connect one device, such as a smartphone, choose a single-port device. If you want to connect two or more devices, choose a device with two or more ports.

Additionally, you need to choose a port that matches the input port of your electronic device, with "USB Type-A" and "USB Type-C" being the mainstream types today.

Make sure to choose a USB power supply that is compatible with the port of the electronic device you want to connect.

Port types

Each USB power supply has a specific power output capability, and you should choose one based on the power consumption of the electronic device you're connecting. The required output for electronic devices is as follows:

Connected Device	Required Output
Smartphone Charging	1A～2A (5V/2.1A: for typical smartphones)
Fast Charging	5A
Navigation System	2A～4A
Heated Grips	3A～4A

Even for single smartphone use, 2A provides peace of mind, but if fast charging is needed, choose 5A or higher.

If the USB power supply supports rapid (fast) charging, it will have "PD" or "QC" indicated.

QC3.0 (Quick Charge) is for Android, and PD (Power Delivery) enables fast charging for iPhones and other devices. Note that the supported fast charging standard and port type vary depending on the smartphone.

Recommended motorcycle USB power supplies

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We will introduce recommended USB power supplies for motorcycles, allowing you to choose based on the electronic devices you connect and your usage environment.

A USB power supply makes motorcycle riding more comfortable and convenient by allowing you to charge your smartphone or connect a navigation system. If you find a USB power supply that interests you, be sure to check it out.

Motorcycle-specific power supply USB Type-C DAYTONA

Source: https://bikeman.jp/products/d-15644

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The "Motorcycle-specific power supply USB Type-C" from DAYTONA is a motorcycle USB power supply that also supports fast charging.

It features a compact L-shaped connector, which prevents wiring from stretching when turning the handlebars, thereby reducing the risk of disconnection.

• Product Name: Motorcycle-Specific Power Supply USB Type-C
• Manufacturer: DAYTONA
• Compatible models: Universal
• Type: USB Type-C
• Cable length: Approx. 800mm from Type-C connector to transformer
• Selling Price (incl. tax): 2,707 yen

USB Power Supply Small Type, Universal, KITACO

Source: https://bikeman.jp/products/kt-80-757-90010

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If you're looking for a USB power supply ideal for mobile power, we recommend the KITACO "USB Power Supply Small Type, Universal".

It features a single USB port with 2,500mA output, making it a simple, minimalist USB power supply for those who only need to charge mobile devices.

• Product Name: USB Power Supply Small Type, Universal
• Manufacturer: KITACO
• Compatible models: Universal
• Port: USB port 2,500mA x 1
• Maximum Output: 2,500mA
• Cord Length: 145mm
• Selling Price (incl. tax): ¥3,451

USB Power Supply Kit, 2-Port Type, Super Cub C125, KITACO

Source: https://bikeman.jp/products/kt-80-757-13110

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For HONDA "Super Cub CT125" owners, we recommend KITACO's "USB Power Supply Kit, 2-Port Type" specifically for the Super Cub CT125.

It features two 1,000mA USB ports, and the power supply connects to the rear brake switch terminal located inside the right body cover.

• Product Name: USB Power Supply Kit, 2-Port Type, Super Cub C125
• Manufacturer: KITACO
• Compatible models: Super Cub C125
• Type: 2-Port Type
• Port: USB port 1,000mA x 2
• Selling Price (incl. tax): ¥3,835

Motorcycle-Specific USB Power Supply Type-C, Universal, PD Compatible, DAYTONA

Source: https://bikeman.jp/products/d-17213

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If you're looking for a USB power supply that supports fast charging, we recommend DAYTONA's "Motorcycle-Specific USB Power Supply Type-C, Universal, PD Compatible."

Despite its compact size, which allows for flexible installation, it supports fast charging with PD3.0. It can be easily connected by simply tightening it together with the brake switch and frame bolt. However, to prevent battery drain, it is advisable to add an ON/OFF switch.

• Product Name: Motorcycle-Specific USB Power Supply Type-C, Universal, PD Compatible
• Manufacturer: DAYTONA
• Compatible models: Universal
• Type: USB PD (Power Delivery) 3.0
• Cord Length: Approx. 500mm from main unit to transformer
• Selling Price (incl. tax): ¥3,835

Motorcycle-Specific Power Supply, Main Key Linked, 1 USB Port, DAYTONA

Source: https://bikeman.jp/products/d-99502

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If you need a high-output USB power supply that links to your main key, we recommend DAYTONA's "Motorcycle-Specific Power Supply, Main Key Linked, 1 USB Port."

The USB port offers a high output of up to 5V/2.4A, and installation is simple: just connect the positive terminal to the flat terminal of the brake switch and the negative terminal to the frame bolt.

• Product Name: Motorcycle-Specific Power Supply, Main Key Linked, 1 USB Port
• Manufacturer: DAYTONA
• Type: 1 USB Port (USB 5V2.4A)
• Cable Length: Approx. 180mm for + side, approx. 800mm for - side, approx. 500mm for USB side
• Selling Price (incl. tax): ¥2,797

Waterproof Motorcycle USB Power Supply, Motorcycle-Specific, Kaedear

Source: www.amazon.co.jp/dp/B0BCFHYP1V

For a USB power supply that is waterproof with a cap and also gentle on your battery, we recommend Kaedear's "Waterproof Motorcycle USB Power Supply, Motorcycle-Specific."

Opening the cap turns the power on, and closing it turns the power off when not in use, preventing dust and other debris from entering. This also helps protect the battery even when wiring directly to it.

• Product Name: Waterproof Motorcycle USB Power Supply, Motorcycle-Specific
• Manufacturer: Kaedear
• Type: Several types available, including USB Type-A and Type-C
• Input Voltage: For 12V battery vehicles
• Selling Price (incl. tax): ¥1,892

Motorcycle USB Power Supply, Waterproof, Motorcycle-Specific, Smartphone Charging, Kaedear

Source: www.amazon.co.jp/dp/B0BNL22Z27

If you're looking for a compact USB power supply suitable for mobile charging, we recommend Kaedear's "Motorcycle USB Power Supply, Waterproof, Motorcycle-Specific, Smartphone Charging."

In addition to models compatible with both USB Type-A and Type-C, you can choose ports to match your electronic devices, such as Type-A only or Type-C only.

• Product Name: Motorcycle USB Power Supply, Waterproof, Motorcycle-Specific, Smartphone Charging
• Manufacturer: Kaedear
• Type: Several types available, including USB Type-A and Type-C
• Input Voltage: DC12V
• Selling Price (incl. tax): ¥2,998