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A hand holds a black JFIND JF107 relay tester device showing various types of relays.
An intelligent relay tester device with red and black components is shown next to a battery pack.
A black JFIND JF107 universal 12V and 24V relay tester device with various testing indicators and a connector.
JFIND JF107 relay tester showing connections and buttons for automotive electrical testing
Comparison showing advantages of a flat design relay tester over a traditional version for insertion testing and larger pin s
Diagram showing the usage steps for a relay tester including battery connection, relay insertion, and testing.
A black JFIND JF107 relay tester device shown from the front.
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Universal Automotive Relay Tester for 12V and 24V Systems

Regular price $50.99 Sale price $43.99

Why customers love it

Diagnose vehicle electrical faults with precision

Bring confidence to your automotive repairs with this universal relay tester, designed to quickly and accurately diagnose issues in both 12V and 24V systems.

  • Automatically identifies 4-pin and 5-pin relay configurations
  • Tests coil resistance, action time, and switching consistency
  • Provides clear LED feedback for immediate fault identification
  • Works reliably across a wide range of automotive relays
A hand holds a black JFIND JF107 relay tester device showing various types of relays.

Precision Diagnostics at Your Fingertips

Pin Configuration Detection

Instantly identifies the correct pin layout for various relay types, saving valuable troubleshooting time.

Comprehensive Performance Check

Accurately measures coil resistance and switching consistency to pinpoint the exact source of the failure.

Clear Fault Indicators

Utilizes distinct green and red LEDs to give you immediate, unambiguous feedback on relay operation.

Setup

Testing in 3 Simple Steps

A straightforward process for reliable relay diagnosis.

  1. Connect the Clip

    Securely attach the alligator clip to the battery terminal of your vehicle.

  2. Apply Power

    Connect the tester to the relay circuit to begin the diagnostic sequence.

  3. Analyze Results

    Observe the LED indicators to determine if the relay is operating normally or experiencing a fault.

Technical Details

Key Specifications

Understanding the capabilities of the universal tester.

Voltage Compatibility
12V and 24V systems
Detected Configurations
4-pin and 5-pin relays
Power Range
11V–25V
Indicator Type
Green (Normal) / Red (Fault)

Why Choose This Tester

Beyond Basic Multimeters

The advantage of specialized relay testing.

Feature
Universal Relay Tester
Generic Multimeter Check
Diagnostic Depth
Tests coil resistance and timing.
Only measures basic voltage/continuity.
Configuration Awareness
Automatically identifies pin layouts.
Requires manual guesswork for pinouts.
Fault Clarity
Uses specific LED signals.
Relies solely on numerical readings.

Our worry-free shopping promise

If your order arrives damaged, defective, or not as described, contact us within 14 days and we will make it right with a replacement or refund.

Frequently Asked Questions

Solving common relay testing concerns.

Can this tester work on relays outside of standard automotive applications?

This tool is specifically designed and calibrated for standard automotive relay systems. It is best used for diagnosing relays found in vehicle or similar electrical setups.

What happens if the LED shows a fault?

A red LED indicates an issue, such as incorrect coil resistance or timing problems. Consult a professional mechanic for repair guidance.

Is the tester suitable for DIY enthusiasts?

Yes, it is ideal for DIY car enthusiasts and auto repair shops looking for a reliable, quick diagnostic tool to troubleshoot electrical issues.

Shipping & returns

Shipping

  • Delivers to United States (based on your selected country/region).
  • Estimated delivery: 3–15 business days after dispatch.
  • Shipping cost: Free.

Returns

You can request a return within 14 days after delivery. Items should be unused and in original packaging where possible. Contact us before sending anything back.