Best 4 Pin Trailer Tester Reviews & Alternatives

A 4 pin trailer tester can be a great investment for those who want to simplify their work needs. With the increase in standing desk popularity, many people looking for the best 4 pin trailer tester feel overwhelmed by the wide range of options available. From traditional 4 pin trailer tester  to convertible models, the dizzying slew of choices might make you feel the need to take advantage

What are the features that make the best 4 pin trailer tester? These compact and convenient 4 pin trailer tester are easy to install and easy to use at the same time. And then there’s the price! Below, we’ll run through the average 4 pin trailer tester cost of some of the most popular types, so you can get a good idea of where to start with your budget.

The reasons you should trust us

We recommend products in each review using an intensive research process, spending hours combing through the best available models on Amazon. For a product to make our list of top picks, it must hold a solid sales record on Amazon, have consistently positive customer reviews, and offer unique features, among other factors. After narrowing down our recommendations, we conduct additional research to ensure that the products meet our standards. Once we conclude the research phase, we craft a well-rounded, user-friendly article that includes our recommended products and additional information to help homeowners like you make the right purchase. The following key factors are considered when analyzing:

  • The quality of 4 pin trailer tester
  • Each product’s design
  • How it’s built
  • Price comparison
  • How durable [replace-keyword] is
  • Features
  • Cost-effectiveness
  • Versatility
  • Product usability
  • The functionality of the 4 pin trailer tester
  • Performance of the products
  • Product dimensions and weight
  • Return policy and warranty, and more.

Best 4 pin trailer tester & Features

1. 4-Way Flat Trailer Wiring Tester [Nickel-Plated Copper Terminals] [Male & Female] [Continuity Test] 4-Pin Trailer Light Wire Circuit Tester

Features :

  • STRAIGHTFORWARD TRAILER LIGHT TESTING – Simply plug the tester inline between the tow vehicle and trailer, turn on the lights and check the easy to read LEDs.
  • ISOLATE PROBLEMS QUICKLY- By effectively splitting the trailer wiring harness in half, problems can be quickly traced to the tow vehicle side or the trailer side wiring.
  • NO TOOLS NEEDED – Plug-n-play design means you don’t need anything else to effectively test your trailer light harness.
  • LONG LASTING CONSTRUCTION – Designed to be weather, corrosion, and impact resistant for years of reliable service.
  • CONVENIENT COMPACT DESIGN -The two-sided design means you can leave it plugged in or store it conveniently in your glove box, door pocket, or tool box.

Additional Info :

Item Dimensions
Height 0.7
Width 3.74
Length 6.5
Weight 0.09

2. CURT 58260 4-Pin Flat Trailer Wiring Towing Vehicle Socket Tester

Features :

  • VERSATILE. Quickly and confidently confirm the functionality of your vehicle’s trailer wiring harness with this connector tester for the taillights, brake lights and turn signals
  • SIMPLE TO USE. For each electrical function, an LED lights up indicating a good signal. Just plug the wiring tester into your vehicle’s socket and have a helper check the LED signals as you activate them from the driver’s seat
  • EASY GRIP. Plugging in this 4-flat trailer light tester into your vehicle is easy with its ergonomic design. It features a tab on the bottom for a better grip when plugging in or unplugging
  • LONG-LASTING LEDS. To produce a bright, easy-to-read signal and ensure long-lasting use, this vehicle-trailer wiring tester is constructed with LED diodes
  • DURABLE HOUSING. To resist the elements and maintain reliable performance, the housing of this tow wiring tester is made from durable black plastic that will never rust or corrode

Additional Info :

Color Original Version
Item Dimensions
Height 4
Width 6
Length 6
Weight 0.05
Release Date 2014-04-16T00:00:01Z

3. TIROL 4 Pin Trailer Tester Connector Trailer Wiring Tester 4-Pin Straight Trailer Light Wire Circuit Tester Car Accessories

Features :

  • Fits 4-Pin Small Size Trailer Light Tester & Circuit Troubleshooter, Quickly and easily see if your trailer wiring is properly installed on your vehicle
  • Small size fits easily in glove compartment or pocket, No Batteries Required.
  • 4 Pin trailer tester: ABS+ Copper material, with TAIL,LT,RT light
  • Test right, left, turn, and brake lights for proper function.
  • Easy to carry, Compact Design Fits in your pocket. If you have any questions please contact us first and we will give you 100% Satisfaction Guaranteed.

Additional Info :

Color 4-Way Plug
Item Dimensions
Height 0.393700787
Width 1.3779527545
Length 1.968503935
Weight 0.0220462262

4. Oyviny 7 Way Blade & 4 Pin Trailer Light Circuit Tester with LED Indicators 6 Function Light Tester for RV Truck Trailer Socket Tester

Features :

  • 2 in 1 Design. This trailer light tester combines both 4 way circuit tester and 7 way trailer light tester, allows you to test both the 4 pin and the 7 blade connectors. Easy and quick to test trailer circuits on most trucks. ( Notes: 📢The trailer tester will upside down when plug into 2017 Newer Ford/GMC/Chevy model 📢This 7 pin trailer plug tester is unable to test LED lighting system)
  • 6 Light Functions. Versatile trailer wiring tester can be used to test 6 separate trailer light functions, quickly confirm the functionality of taillights, brake lights, reverse lights, turn signals, electric trailer brakes and 12V auxiliary power on your vehicle
  • Bright LED Indicators. Plug in 4 way and 7 way trailer light tester equips a LED light for each electrical function. Plugging the light tester and check, you can easily read the green LEDs and find out which wiring has a problem
  • Durable Construction. For long-lasting use, this 7 blade RV trailer tester is made from durable ABS plastic, which will never rust or corrode. Tin-Plated copper terminals makes great conductivity
  • Simple to Use. No batteries or wiring needed! 7 Blade & 4 Pin Tester is easy to use, ergonomic design is convenient for plugging in or unplugging. Widely used to test trailer light circuits on most Trucks, Boats, Trailers Campers, Caravans, Food Vans and other Towed Vehicles

Additional Info :

5. MaxxHaul 50146 4-Way Trailer Wire Circuit Continuity Tester-2 Pack

Features :

  • Designed to test your wiring harness by simply plugging the tester inline between your two vehicle and trailer, turn on your lights and check the easy to read LED indicator lights.
  • Pin point and trace the problem if its on the tow vehicle or the trailer being towed
  • Durable molded plug construction will work in different weather condition and provide many years of service
  • Simple plug and read design to allow you to effective test your trailer lights, isolate the problem and save your valuable time and money
  • Compact design allows you to store in your tool box, glove compartment or anywhere to be ready when you need it
  • LED Connector Tester Comes in 2-Pack

Additional Info :

6. RED WOLF 4-Way Trailer Tester Towing Brake Running Light Circuit Tester 4 pin Flat Connector with Led Indicator for Towing Hitch Trailer RV U-Haul Trucks 2 PCS

Features :

  • Tests 4-way flat connection for tail lights, brake lights and turn signals to note what is wrong with the cable on the car side and without the need of having a spotter
  • Easy to tell. Towing tester is going to be left LED is tail/brakes, middle LED is left turn signal and the right LED is right turn signal. To be extra helpful, this is with the LEDs light up
  • You need to turn on signals, apply brakes, etc. The device simply acts as a trailer light system that you know is functioning properly, allowing you to verify vehicle system is good
  • A good tool when trouble shooting a none working light. If these lights come on as expected, then the issue is downstream of your vehicle wiring
  • This is very handy. Can keep it in your glove compartment. Or carry way it to trailer like U-Haul trailer, truck like Ford GMC Dodge

7. Oyviny 4 Way Flat Trailer Circuit Tester 4 Pin Straight Trailer Light Wiring Socket Tester with LED Indicators for Turn Signal Tail Lights Trouble Shooter Pocket Design (Color:Black)

Features :

  • Suitable for 4-pin small trailer light testers and circuit troubleshooter, quickly and easily check whether your trailer wiring is properly installed on your vehicle
  • Compact pocket design 4 way flat trailer tester with a key ring for easy carry, you can attach it on your key holder. No batteries needed!
  • Brass connectors makes better conductivity; Waterproof ABS Plastic Housing designed to be weather, corrosion, and impact resistant for years of reliable service
  • 4 pin trailer wiring tester plugs into tow vehicle’s conventional 4-prong flat towing plug to test turn right/left, and tailgate light for proper operation
  • Easy to see bright LEDs. Turn on the lights and check, you can easily read the LEDs and find out which wiring has a problem

8. Reese Towpower 74633 4-Way Tester, Black

Features :

  • Tests for properly wired connectors to insure proper operation of trailer lights
  • Raised letters and LED lights for easier use
  • Built in ring for attaching to tool belt
  • Package Dimensions: 17.78 L x 5.588 H x 8.128 W (centimeters)

Additional Info :

Color Black
Item Dimensions
Height 2.2
Width 3.2
Length 7

9. Ram Pro RV Trailer Plug Light Circuit Tester Adapter 7 Way Blade & 4 Pin Trailer Wiring Tester Trailer Light Wire Circuit Tester for Boat SUV Truck

Features :

  • ✓ The Ram Pro 7 Blade & 4 Pin Tester is an extremely useful product when there is an urgent need of checking the configuration of the tow circuit of the vehicle. The product comes handy at the time when the need of checking the circuit’s configuration arises.
  • ✓ SPECS: Our 4 pin tester as indicated by the name of the product comes with seven blades and 4 pins which makes the product perfectly usable.
  • ✓ QUALITY: Our 4 way trailer plug tester is of the premium quality. In an addition to this, the trailer plug tester is extremely easy and convenient to use which is immensely beneficial for the customers. Moreover, the tester is extremely durable in nature and hence are not easily damaged when they are used.
  • ✓ DESIGN: The design so given to the trailer plug tester with seven blades by the manufacturers is just ideal so that the users do not face any kinds of troubles at the time of using the product.
  • ✓ USES: The trailer light tester is just the perfect product to be used in the garages, workshops and a lot of other similar places where there is a need to check the configuration of circuit.

10. IIT 16687 7 Blade & 4 Pin Tester,

Features :

  • Easy to use
  • Has a typical lifetime of 10+ years
  • Checks if the vehicle’s tow circuit is properly configured

Additional Info :

Item Dimensions
Height 16.5
Width 5.5
Length 13.5

Buying Guide for 4 pin trailer tester

To help you buy the perfect 4 pin trailer tester for your needs and requirements, we have mentioned some of the best 4 pin trailer tester in this article. Not only that, but you can also learn about their differences as we have mentioned their major features and options.

To help you on your way, we’ve listed some questions you may want to consider before making any purchase.

  • Why do I want to buy this?
  • Do I need it or just want it?
  • Am I getting the best deal?
  • How often will I use it?
  • Can I pay cash for it?
  • Is it budgeted for?
  • Can I borrow it?
  • Can I get it used?

Although, if you still want to learn more about these 4 pin trailer tester for buying the perfect one, we are here with a detailed buying guide just for you. Since this buying guide is related to 4 pin trailer tester, you can find many major features and aspects related to 4 pin trailer tester. Thus, you can easily choose the perfect one by going through this article until the end.


The 4 pin trailer tester should last more than one use and hold up against normal wear and tear. We recommend reading the product description before purchasing 4 pin trailer tester to ensure they’ll last a while. Additionally, pay attention to the wash instructions.


When choosing the best 4 pin trailer tester, you must consider its versatility.  It is important to make sure that your unit can be used for performing different tasks.

For instance, if you need to use your unit for other purposes in any other materials, getting the one with a versatile design will be an ideal option for you.


The brand is another crucial factor you must consider while looking for the 4 pin trailer tester.  You will find both well-known and unknown brands in the market. If you are looking for a reliable and durable model, I recommend getting one from a well-known brand.

They use high-quality materials and the latest technology to manufacture their products.  As a result, you will be able to get a durable and long-lasting 4 pin trailer tester.

Ease of Use

While choosing the 4 pin trailer tester, you must ensure that it is easy to use.  It is important to get the one that comes with a user-friendly design.


As a result, you will be able to use your unit for a long time without facing any discomfort.  Also, getting the one that comes with an easy-to-use design will help you save a lot of time and effort.


The price is another essential factor you must consider while looking for the 4 pin trailer tester.  You need to get the one that fits your budget perfectly.

Getting the one that comes at an affordable price will help you save a lot of money.  However, you must ensure that it meets your needs and requirements perfectly.


The 4 pin trailer tester should be easy to carry for you. Therefore, consider the size, style, design, and all the other basic features to check for the actual portability of the device. Portability comes with comfort and ease, and you need to look for all the features to look for a suitable 4 pin trailer tester.


The price of your 4 pin trailer tester will depend upon its features and the overall quality. There are some inexpensive options in the market, but they may not have the best features.

The term ‘budget’ is broader because it completely depends on the user who wants to purchase the 4 pin trailer tester. In this case, you can prepare a list of all the features you want to have in your 4 pin trailer tester. Then, look for the product that comes with these features and works well.

After that, you should carefully check the prices of each air compressor machine on your list. This will give you a precise idea about the budget you need to prepare for the 4 pin trailer tester you should go after.


It is important to consider your unit’s weight while working in congested areas. Getting a lightweight model will be ideal if you need to work regularly in difficult-to-reach places.

However, if portability is not your concern and you are looking for a durable model, you can go for the one with a little heavyweight.


The warranty of 4 pin trailer tester is when the manufacturer offers free repairs or replacements for any damages that occur to the product.

You need to check the warranty of 4 pin trailer tester before buying it, as you don’t want a product that doesn’t come with a warranty.

At the same time, you also need to remember that some 4 pin trailer tester come with a longer warranty than others, so select one with a long warranty if possible.

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