AUTOOL RT120 12V Automotive Relay Tester – 4-Pin & 5-Pin Relay Diagnostic Tool Available in Lahore, Islamabad & across Pakistan
The AUTOOL RT120 is a portable automotive relay diagnostic tool developed for testing compatible 12V 4-pin and 5-pin electromechanical relays used in cars, motorcycles and other suitable vehicles. Buy the AUTOOL RT120 12V Automotive Relay Tester in Lahore from AM Auto Tools with 1 year warranty and setup support, delivered to Islamabad, Rawalpindi, Karachi and across Pakistan.
About this item
- Green indicator: The tested relay has passed
- Red indicator with warning sound: The relay has failed or is operating abnormally
- Red clip connects to positive
- Black clip connects to negative
- Confirm that the battery voltage is within the supported 11V–15V range.
- Connect the red clip to the positive battery terminal.
- Connect the black clip to the negative battery terminal.
- Select 4-PIN or 5-PIN mode according to the relay.
- Insert the compatible relay firmly into the appropriate test socket.
- Press POWER to switch on the tester.
- Press TEST to begin the automatic testing sequence.
- Check the green or red result indicator.
- Switch off the tester after completing the test.
- Key Features
- Tests compatible 12V automotive relays
- Supports both 4-pin and 5-pin relays
- Automatic relay operating test
- Performs 10 repeated closing cycles
- Checks relay operating consistency
- Green LED indicates a passed test
- Red LED and audible warning indicate failure
- Simple 4-pin and 5-pin mode selector
- One-button automatic testing
- Insulated positive and negative battery clips
- Approximately one-metre power cable
- Compact handheld construction
- No internal battery or charging required
- Suitable for cars and motorcycles
- Useful for workshops and mobile technicians
- Automotive electricians
- Motorcycle technicians
- Vehicle repair workshops
- Car maintenance centres
- Mobile mechanics
- Electrical diagnostic specialists
- Automotive training centres
- DIY vehicle owners
- Confirm the relay voltage and terminal arrangement
- Observe correct battery polarity
- Keep the clips from touching each other
- Avoid testing damaged or heavily corroded relays
- Disconnect the tester after use
- Follow appropriate automotive electrical-safety procedures
Technical details
| Brand | AUTOOL |
|---|---|
| Model | RT120 |
| Product type | Automotive relay tester |
| Supported relay types | Compatible 4-pin and 5-pin relays |
| Vehicle electrical system | 12V |
| Supported input-voltage range | 11V–15V |
| Working power supply | DC 12V / 1A |
| Automatic test cycles | 10 closing cycles |
| Test-result indication | Green and red LEDs |
| Failure warning | Red indicator and audible alarm |
| Power connection | Insulated battery clips |
| Cable length | Approximately 1 metre |
| Working temperature | -20°C to 60°C |
| Suitable applications | Cars, motorcycles and compatible 12V systems |
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| AUTOOL RT120 12V Automotive Relay Tester – 4-Pin & 5-Pin Relay Diagnostic ToolThis item |  THINKCAR TWB733 3D PROFESSIONAL WHEEL BALANCER |  AUTOOL PT610 Cylinder Pressure Gauge |  AUTOOL PT635 Fuel Pressure Gauge(Hight-end Version) | |
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| Price | Rs 7,500 | Price on request | Rs 28,500 | Rs 58,000 |
| Customer rating | 0 | 0 | 0 | 0 |
| Reviews | 0 | 0 | 0 | 0 |
| Part number | AM-1144 | — | AM-1145 | AM-1147 |
| Warranty | 1 year | 1 year | 1 year | 1 year |
About the AUTOOL RT120 12V Automotive Relay Tester
AUTOOL RT120 12V Automotive Relay Tester
The AUTOOL RT120 is a portable automotive relay diagnostic tool developed for testing compatible 12V 4-pin and 5-pin electromechanical relays used in cars, motorcycles and other suitable vehicles.
We supply the AUTOOL RT120 12V Automotive Relay Tester in Lahore at a competitive price, with support from technicians who use these tools every day.
A faulty relay can cause problems with fuel pumps, cooling fans, horns, lights, air-conditioning systems and other electrical components. The RT120 provides technicians with a quick and convenient way to identify a working or defective relay before replacing components or carrying out more extensive electrical diagnosis.
Fast Automatic Relay Testing
The AUTOOL RT120 simplifies relay inspection by performing the test automatically.
After connecting the tester to a suitable 12V vehicle battery, insert the relay, select either 4-PIN or 5-PIN mode and press the TEST button. The tester repeatedly activates the relay and evaluates its operation.
This quick process helps reduce manual testing time and provides an easy-to-understand result.
Supports 4-Pin and 5-Pin Relays
A dedicated selector switch allows the technician to choose between:
This makes the RT120 suitable for checking many commonly used 12V automotive and motorcycle relays.
Relay terminal layout and electrical specifications can vary. Always confirm compatibility before inserting a relay into the tester.
Clear LED and Audible Results
The tester communicates the result through simple visual indicators:
The straightforward display allows technicians to understand the result without complicated calculations or manual meter readings.
Repeated Testing for Reliable Diagnosis
During operation, the RT120 performs 10 repeated relay closing tests. This helps identify relays that may operate inconsistently instead of checking the relay through only one switching cycle.
The unit is designed to evaluate relay response, repeated operation and consistency during the automatic testing sequence.
Powered Directly by a 12V Vehicle Battery
The tester operates directly from a compatible 12V automotive battery and does not require a separate rechargeable battery.
Its insulated positive and negative clips are attached to the vehicle battery terminals:
The approximately one-metre power lead provides convenient access around the engine compartment or workshop bench.
Simple Operating Procedure
Technical Specifications
Suitable For
The AUTOOL RT120 is suitable for:
Common Relay Applications
Compatible automotive relays may control systems such as:
The RT120 tests the relay itself; it does not diagnose the complete vehicle circuit, wiring harness or control module.
Important Compatibility Notice
The AUTOOL RT120 is intended for compatible 12V electromechanical 4-pin and 5-pin automotive relays . It is not intended for 24V vehicle systems unless the manufacturer specifically states otherwise.
Relays with unusual terminal layouts, integrated electronic components, solid-state construction, diodes, resistors or non-standard electrical characteristics may not be compatible.
A relay passing the test does not confirm that the vehicle wiring, fuse, switch, socket, control module or connected component is functioning correctly.
Why Buy from AM Auto Tools?
AM Auto Tools is a trusted supplier of automobile diagnostic, programming tools, maintenance tools and garage essentials since 1992.
We provide professional product guidance and automotive workshop solutions for technicians and repair businesses across Pakistan.
AM Auto Tools LG-16, Rimpa Center, Abbot Road, Lahore, Pakistan Phone: 0300 4297396 | 0321 4297396
Related tools
For related jobs, see the THINKCAR TWB733 and the AUTOOL PT635, both available from our Lahore shop.
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