---
product_id: 70254383
title: "OTC 3634 Heavy-Duty Straight Cord Circuit Tester"
brand: "otc"
price: "€ 69.99"
currency: EUR
in_stock: true
reviews_count: 13
category: "Otc"
url: https://www.desertcart.hr/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester
store_origin: HR
region: Croatia
---

# Bright replaceable bulb Tests 6V & 12V systems 5-foot heavy-duty cord OTC 3634 Heavy-Duty Straight Cord Circuit Tester

**Brand:** otc
**Price:** € 69.99
**Availability:** ✅ In Stock

## Summary

> 🔧 Power up your diagnostics with precision and durability!

## Quick Answers

- **What is this?** OTC 3634 Heavy-Duty Straight Cord Circuit Tester by otc
- **How much does it cost?** € 69.99 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester)

## Best For

- otc enthusiasts

## Why This Product

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

## Key Features

- • **Ergonomic Precision:** Slim, clear handle designed for comfortable grip and precise circuit testing.
- • **Reliable Connection:** Positive contact-molded strain relief and soldered clip guarantee consistent, accurate readings.
- • **Dual Voltage Mastery:** Seamlessly tests both 6V and 12V electrical systems for versatile diagnostics.
- • **Heavy-Duty Durability:** Equipped with a rugged 5-foot cord and stainless steel probe built to withstand real work environments.
- • **Bright Visual Feedback:** Features a vivid red, replaceable bulb ensuring clear and immediate circuit status visibility.

## Overview

The OTC 3634 Heavy-Duty Straight Cord Circuit Tester is a professional-grade handheld tool designed to efficiently test and locate shorts, grounds, and open circuits in 6V and 12V electrical systems. Featuring a robust 5-foot heavy-duty cord, ergonomic clear handle, bright replaceable bulb, and a stainless steel insulated probe, it delivers reliable, precise diagnostics trusted by seasoned mechanics. Backed by a one-year limited warranty, this tester is built for real work and long-lasting performance.

## Description

OTC Heavy-Duty Straight Cord Circuit Tester is designed for testing electrical circuits and locating shorts, grounds, and open circuits. The features include a 12 foot heavy-duty coiled cord. It checks 6 and 12 volt systems. It has an ergonomic, slim-designed, clear handle. It has a bright red, slim style replaceable bulb. It has a heavy-duty stainless steel probe with insulated shaft and heavy-duty clip with positive soldered connection.

Review: Nice as expected - Nice quality, even has a nice reusable plastic box for storage when not in use. Basic tool, but not cheap wire or clamp. Worth the extra $$$
Review: Identical to the heavy duty one off the tool truck - Same heavy duty tester that cornwell offers or at least the one I've bought off the truck

## Features

- Designed for testing electrical circuits and locating shorts grounds and open circuits
- Features include 5 foot heavy-duty cord and checks both 6 and 12 volt systems
- Ergonomic slim designed clear handle with a bright red slim style replaceable bulb
- Positive contact-molded strain relief

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002YKHCOQ |
| Best Sellers Rank | #285,348 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #376 in Circuit Testers |
| Brand | OTC |
| Brand Name | OTC |
| Color | Red |
| Compatible Devices | Electrical devices with 6-12 volt systems |
| Customer Reviews | 4.8 out of 5 stars 456 Reviews |
| Global Trade Identification Number | 00731413505775 |
| Included Components | Product & Instructions Guide |
| Item Dimensions | 3.35 x 9.55 x 1.75 inches |
| Item Weight | 1 g |
| Item dimensions L x W x H | 3.35 x 9.55 x 1.75 inches |
| Manufacturer | OTC |
| Maximum Operating Voltage | 12 volts |
| Measurement Type | Voltmeter |
| Minimum Operating Voltage | 6 volts_of_direct_current |
| Model | 3634 |
| Number of Items | 1 |
| Part Number | 3634 |
| Power Source | Corded Electric |
| Specification Met | UL |
| Style | Handheld |
| Style Name | Handheld |
| UPC | 731413505775 |
| Unit Count | 1 Count |
| Warranty Description | One (1) year limited warranty |

## Product Details

- **Brand:** OTC
- **Color:** Red
- **Item Weight:** 1 Grams
- **Power Source:** Corded Electric
- **Style:** Handheld

## Images

![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Image 1](https://m.media-amazon.com/images/I/61g1sP6Lr4L.jpg)
![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Image 2](https://m.media-amazon.com/images/I/513TU5EjcAL.jpg)
![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Image 3](https://m.media-amazon.com/images/I/11SMC5vKLAL.jpg)
![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Image 4](https://m.media-amazon.com/images/I/21cPCqXv03L.jpg)

## Questions & Answers

**Q: Is the led bipolar ? I.e. does this work using the clamp on a positive power source to check for negative power with the probe?**
A: It’s not Led, incandescent bulb.

**Q: Does anyone know what’s amperage this test light draws?**
A: I measure 151 mA with a Fluke 87-V.

**Q: Is there a way to put a white light in this one and get rid of the red one?**
A: Not without modifications or using a small low wat incandescent

**Q: What is the actual length and type of cord? Description says 12 foot coiled cord, then it says 5 foot straight cord...? Which is it?**
A: 5 foot heavy duty cord.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Nice as expected
*by D***H on February 10, 2025*

Nice quality, even has a nice reusable plastic box for storage when not in use. Basic tool, but not cheap wire or clamp. Worth the extra $$$

### ⭐⭐⭐⭐⭐ Identical to the heavy duty one off the tool truck
*by M***N on April 28, 2026*

Same heavy duty tester that cornwell offers or at least the one I've bought off the truck

### ⭐⭐⭐⭐⭐ Would recommend
*by C***B on May 1, 2026*

Diesel mechanic for over 35 years. OTC has always been great quality tools.

## Frequently Bought Together

- OTC 3634 Heavy-Duty Straight Cord Circuit Tester, Red
- OTC 3633-10 Replacement Bulb, (Pack of 10)
- Premium LED Bulb Automotive Circuit Tester, 6-24V Test Light with 135 Inch PU Extended Spring Wire, Sharp Hard Steel Probe Vehicle Circuits Low DC Voltage Light Tester

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-09-02*