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Autool  |  SKU: BT260

Autool BT260 | Circuit Tester

€62,95 incl.
€39,95 incl.
€33,02 excl.

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The Autool BT260 circuit tester is engineered for diagnosing electrical systems in passenger cars, commercial vehicles, and agricultural machinery. With a broad measurement range of 0 to 65V, this diagnostic tool is compatible with 12V, 24V, and 48V systems. The tester draws power directly from the included battery clamps or the vehicle's 12V cigarette lighter socket, eliminating the need for internal batteries. The device is purpose-built to quickly identify short circuits, broken wires, and contact resistance in complex vehicle electrical networks, without requiring you to manually connect external power cables.

During diagnostics, the circuit tester measures voltage signals through the integrated copper probe, combined with the additional ground clamp to complete the circuit. Beyond passive measurement, the tool can actively control components such as cooling fans, relays, and windshield wiper motors by manually applying positive or ground voltage via the integrated toggle switch. A polarity indicator with LED lighting instantly shows circuit status, while the illuminated color LCD screen displays precise readings for DC voltage, AC voltage, and resistance. If a short circuit or overload occurs, the automatic circuit protection activates immediately to safeguard both the tester and vehicle electronics, then automatically restarts the device.

KEY FEATURES

✔Fixed 12-meter test cable — Reaches the full length of any vehicle, including tractors and trailers, without extension cords.
✔Works with 12V, 24V, and 48V — Use one tool across passenger cars, commercial vehicles, and agricultural equipment.
✔Measures AC voltage too — Captures peak, minimum, frequency, and duty cycle—essential for crankshaft sensors, alternator ripple, and PWM signals.
✔Self-resetting circuit protection — Cuts power during overload and restarts automatically, with no fuses to replace.

IMPORTANT LIMITATIONS

✕Do not use on sensor wires and communication lines — Applying voltage to circuits connected to the ECU can damage the electronics.
✕Rated current of 1 to 10A — Above that threshold, power delivery stops; high-draw components cannot be controlled directly.
✕Test cable is permanently attached — The 12-meter cable cannot be disconnected, making storage in the hard case less convenient.
✕Powered by the vehicle — The tester cannot operate independently; a dead battery requires an external power source.

Applications and Functionality

The Autool BT260 offers multiple measurement modes for efficiently testing and diagnosing vehicle electrical systems and sensors.

  • DC Voltage Measurement: Test battery voltage and power supply lines in a range of 0 to 65V with 0.1V resolution. Used for checking constant and switched circuits.
  • AC Voltage Measurement: Records maximum and minimum voltage values including frequency and duty cycle. Essential for testing crankshaft sensors, alternator ripple, and PWM-controlled signals.
  • Resistance Measurement: Measures actual resistance values between test probe and ground clamp from 0 to 200 kΩ to detect poor ground connections, corrosion, or internal wire resistance.
  • Diode Test: Checks forward and reverse bias direction of diodes in the electrical circuit, practical for diagnosing blocking diodes in fuse boxes and alternators.

Special Features and Capabilities

Beyond standard measurement functions, this tester is equipped with active features that speed up troubleshooting.

  • Component Activation: Using the physical switch, the technician sends battery voltage or a ground signal directly to the test probe. This allows actuators, starter motors, and lights to be tested for operation instantly.
  • Polarity and Continuity Detection: Provides instant visual feedback via red LED for positive or green LED for ground. At complete continuity of 0.0Ω, an audible signal also sounds for blind wiring checks.
  • Signal and Wire Tracing: Makes irregularities in signal patterns visible, for example with MAP sensors, and traces cables or components from the fuse to the load to locate short circuits.
  • Automatic Short Circuit Protection: The device features thermal protection with a rated current of 1 to 10A. When exceeded, current flow stops immediately, preventing wire burnout or fuse damage during testing.

Package Contents

  • 1x Autool BT260 circuit tester, including fixed 12-meter test cable
  • 1x Battery clamp adapter cable, red and black
  • 1x 12V cigarette lighter adapter
  • 1x Screw-on test probe
  • 1x Hard case storage box
  • 1x User manual
💡
Good to Know: Exercise extreme caution when manually applying 12V or 24V in modern vehicles. Never use the activation function on sensor cables or communication lines such as the CAN-bus that are directly connected to engine management. Disconnect the component being tested from the network as a precaution before applying external voltage.

Technical specifications

General

The brand that manufactures the tester.Brand
Autool
What type of device it is. A circuit tester checks current and earth; a wire tracer locates cables and short circuits.Type of tester
Circuit tester
The on-board voltage the tester can connect to. For testing lorries as well, 24 V or higher is required.Suitable for system voltage
0 to 65 V
Where the tester draws its power from. Via the vehicle battery or circuit, there is no need to replace batteries.Power supply
Via vehicle battery

Measuring

The voltage range in which the tester measures accurately. A wider range is useful for heavier vehicles.DC voltage measuring range
0 to 65 V
The smallest voltage increment the tester can display. The smaller, the more precise the measurement.Voltage measuring resolution
0.1 V
The resistance values the tester can measure, for instance of sensors or wires.Resistance measuring range
0 to 200 kΩ
Whether the tester also measures AC voltage, in addition to DC voltage.AC voltage measurement

Test functions

The tester can supply current to components such as a motor or lamp, so you can see whether they work.Component activation
The tester helps locate the position of a short circuit or broken wire, saving considerable searching.Short circuit and wire break detection
Checks whether a wire or connection conducts current.Continuity test
Shows whether a connection is positive or negative.Polarity check
Checks whether a diode conducts current in one direction only.Diode test

Display and controls

The screen size, measured corner to corner. A larger screen is easier to read.Screen diagonal
1.7 inch
The tester gives a beep or tone, so you do not need to keep looking at the screen.Audible signal

Protection

Which faults the tester protects itself and the vehicle against. This prevents damage from incorrect connection.Protections
  • Overcurrent
  • Short circuit

Dimensions and weight

The length of the test cable. A long cable also allows you to reach the rear of a vehicle.Cable length
12 m

Other specifications

AC Voltage Range
0 - 65V
Rated Current at Protection
1 - 10A
Display
1.7-inch LCD color screen with backlight
Test Probe Length
42 mm
Tester Dimensions, L x W
253 mm x 32 mm