12V Universal Automotive Relay Tester – 4-Pin & 5-Pin Detector

12V Universal Automotive Relay Tester – 4-Pin & 5-Pin DetectorTest & Diagnose Automotive Relays in Seconds Stop guessing and start diagnosing with confidence. The 12V Universal Automotive Relay Tester is a must have tool for mechanics, auto enthusiasts, and DIY car repairers. Compatible with both 4 pin and 5 pin relays, this compact circuit detector quickly identifies faulty relays without removing them from the vehicle saving you time and costly trips to the shop. Whether you're troubleshooting a dead starter

Test & Diagnose Automotive Relays in Seconds

Stop guessing and start diagnosing with confidence. The 12V Universal Automotive Relay Tester is a must-have tool for mechanics, auto enthusiasts, and DIY car repairers. Compatible with both 4-pin and 5-pin relays, this compact circuit detector quickly identifies faulty relays without removing them from the vehicle — saving you time and costly trips to the shop.

Whether you're troubleshooting a dead starter relay, a blown horn relay, or a malfunctioning fuel pump relay, this tester gives you instant, reliable results with minimal effort.

Key Features

• Universal Compatibility: Works with standard 12V 4-pin and 5-pin automotive relays found in most cars, trucks, and SUVs
• Battery Clamp Included: Easily connects to your vehicle's battery for a direct power source — no additional power supply needed
• Circuit Detection: Quickly identifies open, short, or faulty relay circuits so you can pinpoint the problem fast
• Compact & Portable: Lightweight design fits easily in your toolbox, glove box, or workshop drawer
• Easy to Use: No technical expertise required — simply connect, insert the relay, and read the result
• Durable Construction: Built to withstand the demands of everyday automotive diagnostics
• Wide Application: Ideal for testing relays in starter systems, fuel pumps, horns, headlights, fans, and more

What's in the Box

• 1 × 12V Universal Relay Tester (4-Pin & 5-Pin)
• 1 × Battery Clamp Cable

Note: Battery not included.

Made in Mainland China.

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Safety & Compliance

For safe automotive electrical work, always follow best practices when working around vehicle batteries and electrical systems. Learn more about automotive electrical safety from the U.S. Occupational Safety and Health Administration (OSHA).

Learn more: Pico Technology

Frequently Asked Questions

Q: What types of relays does this automotive relay tester support?

A: This universal relay tester supports standard 12V 4-pin and 5-pin automotive relays, which are the most common types found in cars, trucks, and SUVs. It is compatible with relays used in starter systems, fuel pumps, headlights, horns, cooling fans, and more.

Q: Do I need a separate power source to use this relay tester?

A: No external power source or separate battery is required. The tester comes with a battery clamp cable that connects directly to your vehicle's 12V battery, making it convenient to use right at the vehicle without any additional equipment.

Q: Can a beginner use this automotive relay tester effectively?

A: Absolutely. This automotive circuit detector is designed for ease of use — simply attach the battery clamps, insert the relay into the tester socket, and the tester will immediately indicate whether the relay is functioning properly. No advanced technical knowledge is needed.

Q: What is the country of origin for this relay tester?

A: This product is made in Mainland China.