1. Introduction
The AUTOOL BT260 Car Electric Circuit Tester is a versatile diagnostic tool designed for use in 6V to 30V vehicle electrical systems. It provides comprehensive testing capabilities including AC voltage detection, DC voltage detection, resistance detection, diode testing, and features built-in current overload protection. This manual will guide you through the setup, operation, and maintenance of your BT260 tester.
2. Safety Information
- Always wear appropriate personal protective equipment (PPE), such as safety glasses, when working on vehicle electrical systems.
- Ensure the vehicle's ignition is off before connecting or disconnecting the tool to prevent accidental activation of components.
- Do not use the tool if it appears damaged or if any cables are frayed.
- Avoid contact with moving engine parts or hot surfaces during operation.
- Do not exceed the specified voltage range (6V to 30V) for testing.
3. Package Contents
Verify that all items listed below are included in your package:
- 1x AUTOOL BT260 Car Electric Circuit Tester main unit
- 1x User’s Manual
- 1x Battery clamps adaptor
- 1x Battery clamps (red and black)
- 1x Probe tip
- 1x 10m (393 inch) extension cable

4. Product Overview and Components
The AUTOOL BT260 features a robust design with an intuitive interface. Familiarize yourself with the main components:

- Probe Tip: Used to contact the circuit under test.
- Light: Integrated LED flashlight for illuminating dark work areas.
- LCD Display: TFT color display (160 x 128 dpi) showing test results and menu options.
- Power Switch: On/Off switch for the device.
- Mode Button: Cycles through different testing modes.
- Sound/Radiator: Provides audible feedback and heat dissipation.
- Auxiliary Ground Clamp: Connects to a ground point for certain tests.
- Adaptor: Connector for the main cable.
5. Specifications
| Feature | Specification |
|---|---|
| Display | TFT color display (160 x 128 dpi) |
| Operating Voltage Range | 6V to 30V DC |
| External Power Supply | 12.0V or 24.0V via vehicle battery or cigarette lighter |
| Operating Temperature | 0 to 60°C (32 to 140 F°) |
| Storage Temperature | -40 to 70°C (-40 to 185 F°) |
| Item Weight | 1.25 kg (2.75 lbs) |
| Dimensions (L x W x H) | 126 mm (4.96”) x 46.5 mm (1.83”) x 35 mm (1.38”) |
| Extension Cable Length | 10m (393 inch) |
| Certifications | CE |
6. Setup
- Attach Probe Tip: Securely connect the probe tip to the main unit.
- Connect Extension Cable (Optional): If extended reach is required, connect the 10m extension cable between the main unit and the power source cable.
- Power the Device: The BT260 can be powered in two ways:
- Via Vehicle Battery: Connect the red battery clamp to the positive (+) terminal of the vehicle's 12V or 24V battery and the black battery clamp to the negative (-) terminal.
- Via Cigarette Lighter: Insert the cigarette lighter adapter into the vehicle's 12V accessory socket.
- Power On: Flip the Power Switch to the 'ON' position. The AUTOOL logo will appear on the screen, indicating the device is ready.
7. Operating Instructions
The AUTOOL BT260 offers several testing modes. Use the Mode Button to cycle through them.
7.1 DC Voltage Detection Mode
This mode detects the direct current voltage value of the circuit under test. The device automatically identifies and displays the polarity:
- Green Screen: Indicates negative polarity.
- Red Screen: Indicates positive polarity.


7.2 AC Voltage Detection Mode
In this mode, the BT260 detects the maximum and minimum voltage, supply frequency, and duty cycle of the alternating current circuit under test.

7.3 Resistance Detection Mode
This mode measures the resistance value between the probe tip and the auxiliary ground wire. Connect the auxiliary ground clamp to a known good ground point on the vehicle.

7.4 Diode Test Mode
Use this mode to quickly test the working state of diode components and determine if there is continuity or not.

7.5 Flashlight Function
The integrated LED lights on the probe tip provide illumination for working in dimly lit areas. These lights activate automatically when the device is powered on.
7.6 Current Overload Protection
The AUTOOL BT260 is equipped with an automatic current overload protection feature. If the current exceeds a safe limit or the voltage goes above 30V, the device will automatically disconnect the circuit to prevent damage to the tool and the vehicle's electrical system.

7.7 Using the 10m Extension Cable
The included 10m extension cable allows for easy inspection of the entire electrical circuit system, from the front to the rear of the vehicle, without needing to reposition the power source.

7.8 Multi-language Options
The BT260 supports multiple languages for user convenience. You can select from English, Russian, German, Spanish, French, Italian, and Portuguese.

8. Troubleshooting
- Device does not power on: Check that the battery clamps or cigarette lighter adapter are securely connected to a functional 12V or 24V power source. Ensure the power switch is in the 'ON' position.
- Overload protection activates frequently: This indicates a short circuit or excessive current draw in the circuit being tested. Disconnect the tool, investigate the circuit for faults, and resolve them before retesting.
- Inaccurate readings: Ensure the probe tip is making good contact with the test point and that the auxiliary ground clamp is connected to a clean, solid ground.
9. User Tips
- For intermittent issues, try wiggling wires and connectors while testing to identify loose connections.
- Always start with a visual inspection of the wiring and components before using the tester.
- When testing fuses, ensure the fuse is completely removed from its socket to prevent back-feeding current.
10. Maintenance
- Cleaning: Wipe the device and cables with a soft, damp cloth. Do not use abrasive cleaners or solvents.
- Storage: Store the AUTOOL BT260 in its original packaging or a protective case in a dry, cool environment away from direct sunlight and extreme temperatures.
- Probe Tip: Keep the probe tip clean and sharp for accurate readings. Replace if bent or damaged.
11. Warranty and Support
3 Years Warranty: All AUTOOL products purchased from the official store come with a 3-year warranty. For damages caused by non-human factors, AUTOOL promises to resend parts for free within this 3-year period.
Contact Us:
- Website: www.autooltech.com
- Email: aftersale@autooltech.com






