The most important thing to know about your car’s electrical system is that it’s not working properly if you’re not using it. You probably start every trip by turning on the lights, powering up the stereo, and notching up the temperature, so you can understand why so many drivers overlook the electrical system. However, if any of these features fail to turn on, or if the headlights dim when you step on the gas, then the chances are good that your car’s electrical system is on the fritz.
Read on to learn more about the best electrical system tools.
Our Editor’s Best Electrical System Tools Reviews
Bestseller No. 1
Sound Troubleshooting Automotive Relay Tester - 4 & 5 Pin 12V Auto Diagnostic Tool, Small Handheld DIY Car Tester with Battery Clips, Relay Testing Kit, Electrical Systems Tool
- EASY TO USE - The tester will automatically detect the pin position, the release time of the action, and the consistency of the relay in each test phase. If the tester lights up the green LED light, the relay is normal; if the red LED light is on, the relay is abnormal. The relay puller makes it easy to remove the relays to be tested.
- FAST OPERATION - First, clip the alligator clip of the tester to the car battery, the black clip on the negative pole, and the red clip on the positive pole. When the red LED light is on, the tester is ready to start the test. Move the 4 Pin/5 Pin switch to match the number of pins on the relay. Select the appropriate socket according to the relay pins and configuration and insert the relay into the socket. Press the "Test" button, and the tester will automatically begin to operate the relay several times while checking all operations of the relay.
- VERSATILE FITMENT - Suitable for most general-purpose automotive relays on the market. When testing, it needs to be connected to the car's 11V-15V battery. The car battery must be a 12V battery, and the battery voltage must be between 11V-15V; 2. The applicable coil resistance is preferably above 20 ohms. *Not intended for use with all BMW relays*
- COMPACT DESIGN - Our automotive Relay tester is small and easy to carry around for on-the-go jobs or for easy storage. Its compact design allows easy use no matter where you are.
- SIMPLE AND EFFECTIVE - With our patented design this relay tester will give you the results you need quickly and easily. A red light means that the relay is bad, and a green light means the relay is good!
$39.99
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Bestseller No. 2
Autel PowerScan PS100 Circuit Tester, Universal 12V 24V Automotive Power Circuit Probe Kit with 20ft Extension Cable, AC/DC/Continuity/Probe/Signal Test, Activate Component Electrical System Tool
- 【2025 New Autel Circuit Tester: PowerScan PS100】The launch of Autel PowerScan PS100 is to offer quick complete diagnose solution for all 6- to 30-volt vehicle electrical systems, featuring AVOmeter, test light, built-in flashlight, short circuit indicator, relay/component tester, continuity tester and bad ground indicator, the PowerScan is powerful yet affordable, allowing users to check circuitry in one single step. A good-to-have tool for technicians.
- 【Easy Switching 4 Working Modes】Autel PS100 Power Circuit Probe Kit support four working modes: DC voltage, AC voltage, Resistance and Tone On/Off. In AC voltage, PS100 can read the Max. voltage, the Min. voltage, frequency and duty cycle; In Resistance mode, it reads the resistance between the tip and auxiliary ground lead. In Tone On/Off, you can turn off the annoying noise when the tool will be connected to circuits for a long time. Quick switching among 4 modes by pressing mode button.
- 【Compnent Activation Function】Autel PS100 support component activation in 3 different scenario: in the hand, in the vehicle & with ground. By generating activation signals for the components, you can judge whether the components are in good condition, such as lights, motors, wipers, radiator fans, relays, and fuel injectors, etc. You can also use Autel PS100 circuit checker to find bad ground contact. The response of LED lights can intuitively tell you whether it's true ground.
- 【Polarity Quick Identification】In just a few seconds, Autel PS100 can checks component continuity and identifies positive, negative and open circuits. When the positive terminal is connected, the red LED light is on, accompanied by a beep. When the negative terminal is connected, the green LED lights up, along with low pitched tone. If it is an open circuit, the LED light will not light.
- 【Overload Protection & Quick Self-Test】Autel PowerScan PS100 is short-circuit protected. Its internal circuit breaker will trip if it becomes overloaded. The circuit breaker is a valuable test tool as well as a safety measure to protect the tool from overload. To protect your components, Autel PS100 can also perform a quick self-test. After flipping the switch forward or backward, the LED light and tone will respond to quickly check its actual operating status.
$89.99
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Bestseller No. 3
Klein Tools ET310KIT AC Circuit Breaker Finder Kit, Electric Tester, GFCI Tester, Leads, Adapters and Case
- ACCURATE CIRCUIT BREAKER IDENTIFICATION: Quickly locate the correct breaker with precision using the transmitter and receiver of the circuit breaker finder, ensuring efficient electrical troubleshooting
- CLEAR INDICATIONS: The Receiver provides visual and audible cues when the correct breaker is found, ensuring a hassle-free locating process on 90-120V AC circuits
- BUILT-IN GFCI TESTER: The Transmitter includes a GFCI outlet tester, enabling you to inspect wiring conditions and test GFCI devices for added safety
- LIGHT SOCKET AND GROUNDING ADAPTERS: Easily find the correct circuit for a lighting fixture with the light socket adapter, and use the included 3-prong to 2-prong grounding adapter for added convenience
- ALLIGATOR CLIP ADAPTER: Enables testing on bare wires, providing versatile usage options
$69.98
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SaleBestseller No. 4
How to Diagnose and Repair Automotive Electrical Systems (Motorbooks Workshop)
- Martin, Tracy (Author)
- English (Publication Language)
- 160 Pages - 11/10/2005 (Publication Date) - Motorbooks (Publisher)
$23.52
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SaleBestseller No. 5
Automotive Wiring and Electrical Systems (Workbench Series)
- automotive-diagnostic-tools
- Candela, Tony (Author)
- English (Publication Language)
- 144 Pages - 04/02/2009 (Publication Date) - CarTech (Publisher)
$28.99
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Bestseller No. 6
Aochinmoto Upgraded 3.5-36V Automotive Circuit Tester, Test Light with 177 Inch Longer Leads, Power Probe,Car Component Activation Short Circuit Finder Continuity Test
- 【Versatile Electrical Diagnostic Tool】Aochinmoto Multifunctional Power Probe Circuit Tester is a multi-functional electrical automotive circuit tester designed for quick and easy diagnosis of automotive electrical systems.
- 【Voltage & Polarity Tests】3.5-36v low DC volt circuit test light, designed for checking various vehicles’ electrical circuits,such as automotive headlights, taillights, faulty sockets, fuse... This is also a bidirectional voltage tester with volt polarity indicating, you can attach the alligator clamp either to ground or positive.
- 【LCD display & Flashlight Design】Automotive test light with highly clear LCD digital blue backlight display screen, resolution to0.1V voltage reading with high accuracy to ±0.2V. The light tester built-in flashlight, is convenient for testing and repairing in a dark place, and can also be used as a light.
- 【Long Test Wiring& Large Alligator Clip】Aochinmoto power probe multimeter comes with a 14.7 feet long cable and large size alligator clip, allows you to easily bring power and ground from the battery to the dash or where ever you need to test.
- 【Wide Application】 The power circuit probe tester supports all 3.5-36V vehicle electrical system testing, including cars, pickups, trucks, suvs, motorcycles, boats, etc. And the tester also has an overload protection device, When the current exceeds 8A, the circuit breaker inside the device will automatically trip and give out a buzzer prompt.
$21.99
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SaleBestseller No. 7
AWBLIN Power Circuit Probe Tester, LCD Digital Automotive Test Light with Voltage Display&Illumination, DC Voltage Tester, Electrical System Tool, Relay Fuse Continuity Current Test.
- MULTIFUNCTIONAL CIRCUIT PROBE TESTER：The power circuit probe tester has multiple functions, such as detection Circuit Polarity, Voltage, Connection, Break, Lighting, Ignition Plug, Sensor Measurement, Grounding Test, Continuity Test, Component Activation and other functions. No additional tools needed to help you reduce car diagnosis time.
- 2 WORKING MODES: The automotive test light supports 2 working modes: voltage mode and current mode(Resolution: 0.1V/0.1A), Two Clip Supply voltage: 5-36VDC, Probe test voltage: 1-60VDC, Probe test current: DC 0-8A. The electric test Pen usually default voltage mode, press the small black round button, you can easily switch to the current mode. It is powered by vehicle’s battery, no extra battery needed.
- EASY TO READ: The circuit tester combines an LCD digital backlight display with an LED red/green indicator light design, making it easier to read the voltage and current values of the screen and distinguish between positive and negative electrodes.
- ILLUMINATION FUNCTION: the test light probe built-in flashlight is bright enough to light up your work area. When the two alligator clamps respectively clamp the positive and negative ends of the battery, the flashlight immediately lights up, which is more convenient for you to test at night or in dark areas.
- OVERLOAD PROTECTION & BUZZER ALARM: In voltage mode, the Tester will display overvoltage warning when voltage exceeds 61VDC. The LCD will display “OL”, red LED light on. In current mode, If the current is too high, the LCD will display “OL”, buzzer alarm. When the current exceeds 8A, the tester will automatically disconnect to protect the circuit to reduce unnecessary losses. The disconnection time varies with the load current.
$26.39
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SaleBestseller No. 8
4pcs Professional Electrical Disconnect Pliers for Cars, Automotive Electrical Connector Pliers, Automotive Test Light, Electrical Plug Pliers & Connector Removal Tool Kit for Wire Terminals
- Designed for Automotive Electrical Connectors: The electrical disconnect pliers are designed for easy removal of locking push-tab connectors on sensors, fuel injectors, ignition coils, and more. With 60-degree and right-angle designs for one-handed control, these automotive electrical connector pliers are perfect for tight spaces and compatible with all vehicles
- Prevent Damage to Wiring Harnesses and Sensors: The electrical connector disconnect tool ensures safe, non-damaging removal of weatherpacks and push-pull connectors. It features a dual-angle tip and non-slip handle, perfect for tight engine bays. The pointed tip unlocks the pull tab while the hooked end lifts the connector, keeping wiring harnesses and sensors intact during repairs or upgrades
- Versatile Dual-Tip Design for Multiple Angles: Our electrical disconnect pliers come with dual-tip tips to handle connectors from all angles. The angled tips handle connectors behind stubborn clips while the straight tips are perfect for straight-pull applications. Ideal for fuel injector plugs, weatherpack connectors, ignition coils, and sensor housings, these pliers provide comfort and control for all your electrical repairs
- Clear Digital Display & Readouts: automotive circuit tester with a highly clear LED digital display for voltage readings, 0.1V resolution with ±0.2V accuracy gives you clearly visible digital readouts. Compared with LCD lights, this light tester is not affected by the brightness of light, so that be clearly read in daytime or dark areas
- Extended Spring Wire with Alligator Clip: Maximum extended to 110 inch long enough spring wire increases flexibility and a wide measuring area when testing, anti-bending design of the tail wire makes no worry about bad contact of the line. Along with large size alligator clip for easy one-hand operation
$27.99
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Bestseller No. 9
Magnepull XP1000-LC Magnetic Wire Puller for Electrical Tools W/Flexible Steel Leader & Durable Case, Does not work on Foam Insulation also not rcomended for steel studs without XP1000-8 Drop Magnet
- MAGNEPULL XP1000-LC: Introducing the revolutionary Magnepull XP1000-LC, the ultimate tool for effortless cable installation and retrieval! This state-of-the-art device is an absolute game-changer, designed to streamline your cable management tasks with unprecedented precision and ease. The Magnepull XP wire puller boasts cutting-edge technology, ensuring a seamless and efficient experience.
- PATENTED RADIAL MAGNET DESIGN: This compact yet powerful wire-pulling tool utilizes a patented magnetic system, which effectively attracts and guides cables through walls, ceilings, and tight spaces. This patented radial magnet design with a self-locking clutch ensures maximum pull strength. The Magnepull xp1000 patented radial magnet design allows the magnet to penetrate the insulation without damage.
- DURABILITY: The ergonomic design ensures comfort during use, while the durable construction guarantees long-lasting performance. Crafted with precision engineering, the Magnepull wire-pulling system is a must-have for professionals and DIY enthusiasts alike. Made out of a glass-filled nylon handle guaranteed for the life of the tool. Magnepull XP1000 comes with a durable carrying case with stainless latches and integrated handles.
- VERSATILITY: Designed for versatility, the Magnepull XP1000-LC is compatible with a wide range of cable types, including Ethernet, coaxial, and HDMI cables. Whether you're setting up a home theater system, optimizing your network connections, or enhancing your security infrastructure, this tool adapts to your needs effortlessly.
- WALL FISHING TOOL: Say goodbye to frustrating cable snags and tedious installations – this cable puller tool kit’s advanced magnetic technology guarantees a smooth and swift process, saving you valuable time and effort. With its unparalleled magnetic force, you'll effortlessly navigate even the most intricate cable paths.
$135.00
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SaleBestseller No. 10
allsun 6-24Vdc Auto Power Circuit Probe Tester,Power Circuit Detector Electric Test Tool Kit Pen,Short Circuit Finder Test Light Continuity/Polarity of a Voltage,Test Lead 5M(16Ft) Light & Buzzer
- Widely Application: Auto Circuit Breaker Tester can test for continuity. Test for polarity of a voltage. Check switches, relays and the on-off of diodes, fuses and circuits . Test for polarity of electric cables and plugs. Track and locate short circuits. Test for bad ground contacts.
- Long Test Lead: Polarity Tester, the cable length is about 5m(16ft) which allows you test any electrical system easily. Operation Instrcution: Unroll the unit's cable. Clamp the red clip to the positive terminal of the vehicle's battery. Clamp the black clip to the negative terminal of the vehicle's battery.
- With An Alarm Sound: Car Circuit Scanner Diagnostic Tool made by the item indicates that the circuit breaker trips off. After the circuit breaker trips, it will reset automatically within 3 to 5 seconds. After an alarm sound, if this item is still connected with the testing object and you keep pressing down the switch, the circuit breaker will repeat the process of trip and reset automatically.
- Makes Your Testing Easily: Circuit Breaker Locator Tool has Long Cable, it is a Comprehensive 6-24V DC test kit. After a simple hook-up of the unit to the vehicle's battery, automotive technician can conduct a positive or negative battery current to the tip by rocking the switch forward or backward.
- Reducing Diagnpstic Time: Power Tester is an Electrical Tester for Reducing Diagnostic Time in Automotive Electrical Systems. The unit has short-circuit protection and can test for bad ground contacts instantly.
$15.53
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Best Electrical System Tools Buying Guide
Before choosing the best electrical system tools you should consider following options:
1. Voltage Tester: One of the most important tools that you can use for electrical evaluations is a voltage tester. This is a device that you can use to test the voltage of an electrical outlet.
While you can use this for new outlets in your home, you can also use it in the field when you want to check the voltage of a circuit breaker or outlet.
2. Fish Tape: A fish tape is essentially a piece of steel wire with a handle on one end and a hook on the other end. This is a very useful tool that you can use when you need to pull cables through conduit.
When you need to pull a cable through a conduit, you can attach it to the fish tape and then use it to pull the cable through.
3. Stethoscope: If you are going to do electrical evaluations, then you need to have a stethoscope on hand. This is a device that you can use to listen to various sounds that are produced when electricity is flowing.
When you listen to the sounds produced by electricity, you can get an idea of what is going wrong and what needs to be done.
4. Continuity Tester: When you are going to do electrical evaluations, you need to have a continuity tester on hand. This is a device that you can use to test whether two conductors in an electrical system are electrically connected.
You can use a continuity tester in a number of different situations. For example, you can use it to test whether two wires are electrically connected or whether a wire is broken.
You can also use this for testing whether a switch is in the on or off position. There are various types of continuity testers that you can choose from. Some of them are designed to test different voltage levels and some of them are designed to test lower voltage levels.
5. Test Lead Set: A test lead set is essentially a collection of test probes that you can use when you are carrying out electrical assessments. These are very useful tools that can help you detect problems with electricity and can help you detect when something is wrong.
What else you should know about electrical system tools
1. What are the most common electrical system tools?
The most common electrical system tools are screwdrivers, wire strippers, and pliers.
2. What are the most important electrical system tools?
The most important electrical system tools are circuit breakers, fuses, and grounding rods.
3. What are the most dangerous electrical system tools?
The most dangerous electrical system tools are those that are not properly grounded or those that are not properly insulated.
4. What are the most expensive electrical system tools?
The most expensive electrical system tools are circuit breakers, fuses, and transformers.
5. What are the most versatile electrical system tools?
The most versatile electrical system tools are those that can be used for a variety of tasks, such as testing, diagnostics, and repairs. Some of the most versatile electrical system tools include multimeters, circuit testers, and voltage testers.
Conclusion
On the market, there are numerous best electrical system tools. Hopefully, the list of the top ten best electrical system tools will save you time researching and deciding on the best one for you.