---
product_id: 70254383
title: "OTC 3634 Heavy-Duty Straight Cord Circuit Tester, Red"
brand: "otc"
price: "R839"
currency: ZAR
in_stock: true
reviews_count: 13
category: "Otc"
url: https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-red
store_origin: ZA
region: South Africa
---

# Bright replaceable bulb Tests 6-12V circuits Heavy-duty 12ft cord OTC 3634 Heavy-Duty Straight Cord Circuit Tester, Red

**Brand:** otc
**Price:** R839
**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, Red by otc
- **How much does it cost?** R839 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-red)

## 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

- • **Robust 12-Foot Cord:** Heavy-duty straight cord designed for durability and tangle-free use.
- • **Ergonomic Clear Handle:** Slim, comfortable grip with a transparent design for confident testing.
- • **Heavy-Duty Probe & Clip:** Stainless steel probe and positive soldered clip ensure reliable contact every time.
- • **Bright Red Replaceable Bulb:** Instant visual feedback with a stylish, easy-to-swap indicator.
- • **Precision Circuit Diagnosis:** Pinpoint shorts, grounds, and open circuits with ease.

## Overview

The OTC 3634 Heavy-Duty Straight Cord Circuit Tester is a professional-grade handheld tool designed to test 6 and 12 volt electrical circuits. Featuring a durable 12-foot straight cord, ergonomic clear handle, bright replaceable bulb, and heavy-duty stainless steel probe with insulated shaft, it delivers reliable and precise circuit diagnostics for electricians and DIY pros alike.

## 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: Excelente probador de circuitos lo recomiendo
Review: Great quality - Very durable. I like straight cords better than stretchy as they are stronger and don’t get caught on things. Very well made. Rubber sheath wore off after much use. Just replace with a piece of heat shrink if it does come off. Clamp is heavy duty. Great quality.

## 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 | #88,464 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #155 in Circuit Testers |
| Brand | OTC |
| Color | Red |
| Customer Reviews | 4.7 4.7 out of 5 stars (448) |
| Date First Available | March 15, 2007 |
| Global Trade Identification Number | 00731413505775 |
| Is Discontinued By Manufacturer | No |
| Item Weight | 0.035 ounces |
| Item dimensions L x W x H | 3.35 x 9.55 x 1.75 inches |
| Item model number | 3634 |
| Manufacturer | OTC |
| Manufacturer Part Number | 3634 |
| Maximum Operating Voltage | 12 Volts |
| Measurement Type | Voltmeter |
| Min. Operating Voltage | 6 Volts (DC) |
| Model | 3634 |
| Power Source | Corded Electric |
| Product Dimensions | 3.35 x 9.55 x 1.75 inches |
| Specification Met | UL |
| Style | Handheld |
| UPC | 731413505775 |
| Voltage | 12 Volts |

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

### ⭐⭐⭐⭐⭐ Review
*by Y***I on November 2, 2025*

Excelente probador de circuitos lo recomiendo

### ⭐⭐⭐⭐⭐ Great quality
*by S***H on October 5, 2025*

Very durable. I like straight cords better than stretchy as they are stronger and don’t get caught on things. Very well made. Rubber sheath wore off after much use. Just replace with a piece of heat shrink if it does come off. Clamp is heavy duty. Great quality.

### ⭐⭐⭐⭐⭐ Best Test Light out there by far!
*by Y***. on June 30, 2025*

Best test light out there. Use it from simple light testing up to circuit response testing 5V sensors. Love the feel of it, definitely quality. This tool paired with a good Multi Meter can take on anything.

## 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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**Shop now:** [https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-red](https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-red)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-23*