Automotive relay tester CNBJ-707, 12V

Function and purpose:

The CNBJ-707 automotive relay tester is a fast and practical tool designed to test 12V 4-pin and 5-pin relays. It connects directly to the vehicle’s battery and allows quick evaluation of relay condition and switching behavior. Suitable for workshops, auto electricians and car owners who need a simple and reliable “good / bad” relay test.
Key advantages:

• Fast testing of 12V automotive relays (4-pin and 5-pin)
• Clear LED indication – green (good), red (faulty)
• Checks pin configuration and internal switching behavior
• Automatic multi-cycle ON/OFF activation
• Very easy to use – connect, insert relay, press “TEST”
• Compact, lightweight design
• Saves time compared to manual testing in the vehicle wiring
Technical specifications:

Model: CNBJ-707
Power supply: 12V car battery (approx. 11 – 15V)
Relay types: 4-pin and 5-pin 12V relays
Recommended coil resistance: above ~20 Ω
LED indication: green – OK; red – faulty or wrong pin-out
Material: plastic housing with metal terminals
Color: red / black
Dimensions: approx. 13 × 7 × 3 cm
Weight: 0.25 – 0.30 kg
Operating environment: 12V automotive electrical systems
How to use:

• Connect the black clip to battery negative (-) and the red clip to battery positive (+)
• The red LED lights up – the tester is powered
• Insert the relay into the appropriate socket (4-pin or 5-pin)
• Press the “TEST” button
• The tester switches the relay several times to check its operation
• Green LED = relay good; red LED = faulty or abnormal behavior
Applications:

• Testing relays for headlights, cooling fans, pumps, compressors and other automotive systems
• Quick troubleshooting in workshops or mobile service
• Testing relays before installation
• Detecting delayed switching, sticking contacts or burnt contacts
Package includes:

• 1 × CNBJ-707 automotive relay tester
• Built-in cables with crocodile clips
• User manual (if included)
FAQ:

Can it be used without a battery?
No – it requires a 12V automotive battery to operate.

Is it suitable for 24V relays?
No – this model is intended only for 12V relays.

Can it damage the relay?
No, not when used correctly and powered with a healthy battery.

Does it test the load controlled by the relay?
No – it tests only the relay itself, not the circuit it drives.