Vortek RT01 Relay Tester & Battery Voltage Detector
Vortek RT01 Relay Tester & Battery Voltage Detector
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Test Any Relay in Seconds. Know If It's Good or Dead Before You Replace It.
A faulty relay can cause anything from a non-starting engine to a dead horn or a fan that won't run — but relays look identical whether they're working or not. This relay tester tells you in seconds whether a relay is good or dead, and also reads your battery voltage, all powered directly from your car battery.
- ✓ Tests 4-pin and 5-pin relays — covers the most common relay types in passenger vehicles
- ✓ Green/red indicator lights give you an instant GOOD or DEAD result
- ✓ LED display shows live battery voltage (12V–24V) — two tools in one
Why Relay Faults Are So Frustrating to Diagnose
Relays are cheap and easy to replace — but only if you know which one is faulty. Without a tester, you're either swapping relays one by one and hoping for the best, or paying a workshop to run a diagnostic. A relay tester removes the guesswork entirely: pull the relay, insert it into the tester, press the button, and you have your answer in seconds.
4 Steps. Seconds. Done.
- Connect the alligator clips to your positive and negative battery terminals
- Insert the relay into the matching 4-pin or 5-pin jack
- Press the TEST button
- Read the result — green light means good, red light means faulty
The LED display also shows your battery voltage throughout, so you can check the state of your battery at the same time.
Why It Works
Green light confirms the relay is working. Red light confirms it's faulty. No interpretation needed.
Two relay jacks cover the most common relay configurations found in passenger vehicles and bakkies.
The LED display shows your battery voltage in real time — useful for checking battery health while you're diagnosing electrical faults.
Powered directly from your car battery via the included alligator clips — no batteries or chargers required.
Features & Specifications
- Model: Vortek RT01
- Tests: 4-pin and 5-pin automotive relays
- Result indicators: Green LED (GOOD) and Red LED (DEAD/FAULTY)
- LED display: Shows live battery voltage
- Input voltage: 12V–24V (works on cars and bakkies)
- Power source: Vehicle battery via alligator clips (included)
- Includes Vortek gift box
When You'll Use This
- Diagnosing a non-starting vehicle where a relay is suspected
- Testing fuel pump, horn, fan, or starter relays before replacing them
- Checking battery voltage as part of an electrical fault diagnosis
- Quickly verifying a replacement relay before fitting it
Who It's For
- Home mechanics diagnosing electrical faults without a workshop scanner
- Workshop technicians who want a fast relay check tool
- Anyone who's replaced a relay on a guess and wants a better way next time
What's in the Box
- 1 × Vortek RT01 Relay Tester & Battery Voltage Detector
- 1 × Set of alligator clips (red and black)
- 1 × Vortek gift box
Compatibility
Compatible with standard 4-pin and 5-pin automotive relays. Works on 12V and 24V systems, covering most passenger vehicles, bakkies, and light commercial vehicles. Not suitable for solid-state relays or relays with non-standard pin configurations.
What customers love about it.
"My Hilux wouldn't start and I suspected the fuel pump relay. Tested it with this in about 30 seconds — red light, dead relay. Replaced it and the bakkie started immediately. This tool paid for itself on the first use."
"Handy little tool. Used it to test a few relays on my Golf after the horn stopped working. Found the faulty one quickly. The battery voltage display is a bonus. Instructions could be clearer but it's straightforward once you try it."
"Keep this in the workshop now for any electrical complaint. Relay testing used to take ages, now it takes seconds. The voltage display is useful too — often tells you something about the battery while you're at it."
Frequently Asked Questions
The tester has two jacks — one for 4-pin relays and one for 5-pin relays. These cover the most common automotive relay configurations. It is not suitable for solid-state relays or non-standard pin layouts.
Yes — the tester works on 12V to 24V systems, so it's suitable for both passenger vehicles and light commercial vehicles.
Yes — pull the relay from its socket in the fuse box, insert it into the matching jack on the tester, and press TEST. The relay is tested off the vehicle.
The LED display shows the voltage of the battery the tester is connected to. This gives you a quick indication of battery health alongside your relay test.
Stop Guessing. Test It First.
Relays are cheap — but replacing the wrong one wastes time and money. The Vortek RT01 Relay Tester gives you a definitive answer in seconds so you replace only what's actually faulty. Add it to your diagnostic toolkit today.
