---
product_id: 31277353
title: "EZ TROUBLESHOOTER Circuit Tester"
brand: "seasense"
price: "HK$134"
currency: HKD
in_stock: true
reviews_count: 13
category: "Sea Sense"
url: https://www.desertcart.hk/products/31277353-ez-troubleshooter-circuit-tester
store_origin: HK
region: Hong Kong
---

# Instant LED power indicator Waterproof PVC casing 4-prong flat plug compatible EZ TROUBLESHOOTER Circuit Tester

**Brand:** seasense
**Price:** HK$134
**Availability:** ✅ In Stock

## Summary

> 🔧 Don’t tow blind—test your trailer wiring like a pro!

## Quick Answers

- **What is this?** EZ TROUBLESHOOTER Circuit Tester by seasense
- **How much does it cost?** HK$134 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/31277353-ez-troubleshooter-circuit-tester)

## Best For

- seasense enthusiasts

## Why This Product

- Trusted seasense brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **LED Power Indicator:** Green light confirms active circuits—no guesswork, just clarity.
- • **Compact & Lightweight:** Fits effortlessly in your glove box at just 0.8 ounces for on-the-go testing.
- • **Plug & Play Confidence:** Instantly verify your trailer’s wiring with a simple 4-prong connection.
- • **Weatherproof Durability:** Rugged waterproof PVC housing built to withstand outdoor conditions.
- • **Trusted by Pros & DIYers:** Highly rated with 4.7 stars and thousands of users ensuring peace of mind.

## Overview

The SeaSense EZ TROUBLESHOOTER is a compact, waterproof circuit tester designed for quick and reliable verification of 4-prong flat trailer wiring. Featuring an intuitive LED indicator, it ensures your vehicle’s turn signals, lights, and brakes are properly powered before you hit the road. Lightweight and durable, it’s a must-have tool for every trailer owner seeking hassle-free, on-the-spot diagnostics.

## Description

Plug tester into vehicle’s conventional 4-prong flat towing plug. Operate vehicle's turn signals, lights and brakes. When power is present, circuit's green light will glow. Waterproof PVC material

Review: Absolutely worth the money! - I have a Toyota Highlander and am pulling a very small U-Haul trailer. Ordered the wiring kit online, hooked it up, went down to U-Haul and they didn’t have one of these testers so they had me back up to a trailer, plug in and the lights didn’t come on. He said for me to rent a trailer the lights had to work. Figured I must of hooked something up wrong. Instead of driving back down to the U-Haul place every time I needed to test if my wiring was correct I just ordered this tool and it worked flawlessly! For $4 bucks it was definitely worth it! Now I just have it in my glove box and anytime I’m hooking up a trailer I can test my lights easily to know if my lights aren’t working or if the trailer lights aren’t working.
Review: easy to check trailer wiring on my car - can't check electrical stuff to save my life. fortunately this was easy! car came from factory pre-wired for a hitch. curt wiring harness plugged right in to factory outlet. plugged this tester into the 4-prong end of harness and it lit up when lights were turned on, turn signals went left /right. money well spent for piece of mind. couldn't check the brakes because it was just me. so will check it when i have a helper.

## Features

- Package length: 9.144 cm
- Package width: 6.858 cm
- Package height: 0.254 cm
- Product Type: FISHING EQUIPMENT

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0019LYDLQ |
| Best Sellers Rank | #488,917 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #513 in Boat Trailer Guides & Rollers |
| Brand | SeaSense |
| Brand Name | SeaSense |
| Color | Regular |
| Customer Reviews | 4.7 4.7 out of 5 stars (1,947) |
| Date First Available | August 25, 2003 |
| Global Trade Identification Number | 00737765803040 |
| Included Components | Circuit Tester |
| Item Package Dimensions L x W x H | 3.7 x 2.7 x 0.4 inches |
| Item Weight | 22.68 g |
| Manufacturer | Unified Marine, Inc. |
| Material | Plastic |
| Measurement Type | Ohmmeter |
| Number of Items | 1 |
| Package Weight | 0.09 Kilograms |
| Part Number | 50080304 |
| Power Source | Corded Electric |
| Size | 0.8 ounces |
| Specification Met | UL |
| Sport Type | Boating |
| Style | Flat |
| UPC | 737765803040 744288432589 757183021000 |

## Product Details

- **Brand:** SeaSense
- **Color:** Regular
- **Item Weight:** 22.68 g
- **Power Source:** Corded Electric
- **Style:** Flat

## Images

![EZ TROUBLESHOOTER Circuit Tester - Image 1](https://m.media-amazon.com/images/I/5158pN6kwvL.jpg)
![EZ TROUBLESHOOTER Circuit Tester - Image 2](https://m.media-amazon.com/images/I/515kMHUYPYL.jpg)
![EZ TROUBLESHOOTER Circuit Tester - Image 3](https://m.media-amazon.com/images/I/61kbglzjbwL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Absolutely worth the money!
*by N***E on September 13, 2018*

I have a Toyota Highlander and am pulling a very small U-Haul trailer. Ordered the wiring kit online, hooked it up, went down to U-Haul and they didn’t have one of these testers so they had me back up to a trailer, plug in and the lights didn’t come on. He said for me to rent a trailer the lights had to work. Figured I must of hooked something up wrong. Instead of driving back down to the U-Haul place every time I needed to test if my wiring was correct I just ordered this tool and it worked flawlessly! For $4 bucks it was definitely worth it! Now I just have it in my glove box and anytime I’m hooking up a trailer I can test my lights easily to know if my lights aren’t working or if the trailer lights aren’t working.

### ⭐⭐⭐⭐⭐ easy to check trailer wiring on my car
*by G***R on August 8, 2021*

can't check electrical stuff to save my life. fortunately this was easy! car came from factory pre-wired for a hitch. curt wiring harness plugged right in to factory outlet. plugged this tester into the 4-prong end of harness and it lit up when lights were turned on, turn signals went left /right. money well spent for piece of mind. couldn't check the brakes because it was just me. so will check it when i have a helper.

### ⭐⭐⭐⭐⭐ Idiot proof and well made. It is a simple device that works.
*by R***K on December 31, 2019*

I just added trailer wiring to my Jeep and wanted an easy way to verify it was wired right since I did not have a trailer yet. I bought this tester and as shown in the video and photos it works. I keep it in the glove compartment and expect it to be useful if I rent or go shopping for a vehicle that I want to check the trailer hitch wiring on it.

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**Shop now:** [https://www.desertcart.hk/products/31277353-ez-troubleshooter-circuit-tester](https://www.desertcart.hk/products/31277353-ez-troubleshooter-circuit-tester)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-02-26*