12V Car Relay Tester with LED Indicator, Cordless Battery Checker
Meet the 12V Car Relay Tester with LED Indicator, a portable, USB-C powered tool designed for quick, safe relay testing in automotive electrical systems. It checks 4-pin and 5-pin relays for coil on/off state and contact status, delivering a clear result within about 10 seconds. Its cordless design and USB-C powered operation make it ideal for in-vehicle diagnostics, service bays, and hobby projects. The built-in LED indicator provides an immediate visual readout, so you don’t have to guess whether a relay is working.
Powered by TYPE-C input, it provides 5VDC at 1–2A and outputs 12V DC to the relay coil during testing. It works with a USB-C data cable and is compatible with mobile phones, power banks, car power supplies, and adapters—giving you true cordless testing versatility. Attention: Mobile phone power supply requires a TYPE-C to TYPE-C cable (Not included). Our product only provides a USB to TYPE-C cable.
How it works: use the toggle to switch between 4-pin and 5-pin relays, press TEST to trigger the detection process, and read results from the dual-color LED indicator. Normal operation is signaled by the green light flashing once per second for a total of 10 times, accompanied by a brief beep sequence, indicating the relay is functioning properly. If a fault is detected, the red light stays on. The tester is suitable for coils with resistance of 20Ω or greater and operates across a wide temperature range from -10℃ to 50℃. Power consumption remains under 10W, making it efficient for repeated use in various environments.
Design details you’ll appreciate include a dedicated POWER switch (ON/OFF), a RESET button (TEST) to trigger detection, a center- panel LED for results, and a toggle switch to select 4-pin or 5-pin relays. An additional side LED lighting control helps you use the tester in dark areas without strain.
Benefits & Tips
- Quickly verify relay coil and contact status before wiring or replacing essential circuits, reducing downtime and miswiring risks.
- Use with a power bank or car USB supply for true cordless testing anywhere—perfect for field service or on-the-go diagnostics.
- Keep a small testing routine: toggle to 4-pin or 5-pin, press TEST, and listen for the beeps plus watch the LED color to confirm operation at a glance.
Product specifications
- Power interface: TYPE-C
- Input voltage/current: 5VDC, 1A–2A
- Output detection voltage (coil): 12V DC
- Applicable relay pin numbers: 4PIN, 5PIN (12V electromagnetic relay)
- Detection response time: 1 second/time
- Applicable pins: 4-pin/5-pin
- Working temperature range: -10℃ to 50℃
- Rated power: <10W
- Use coil resistance: ≥ 20Ω
- Power supply: USB data cable
- Compatible with TYPE-C data cables, mobile phones, power banks, car power supplies, adapters
Package includes
- 1 x Relay Tester
- 1 x USB cable
- 1 x Manual
Warnings/Reminders
- Power input is 5V DC; use a supply within the 1–2A range for reliable operation.
- Operating temperature should be between -10℃ and 50℃; ensure ambient temperature during charging is above 0℃.
- For mobile power, use a TYPE-C to TYPE-C cable (not included); this unit ships with a USB to TYPE-C cable instead.
- Always toggle to the correct relay pin configuration (4-pin or 5-pin) before testing to avoid incorrect readings.
Language support: Not specified
All electronic and mechanical equipment, devices and machines sold by InterCyprus to EU countries are CE certified and carry a two year warranty.
At intercyprus.com since 2002 — trusted for quality and reliability.