--- product_id: 70254383 title: "OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord" brand: "otc" price: "R1243" 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-designed-testing 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 - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord **Brand:** otc **Price:** R1243 **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 - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord by otc - **How much does it cost?** R1243 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-designed-testing) ## 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: Would recommend - Diesel mechanic for over 35 years. OTC has always been great quality tools. Review: Real tool for real work - Was tired of Harbor Freight drop it once, and throw it out. This is the real tool for real work. ## 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 | #119,375 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #179 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 455 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 Grams | | 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 (DC) | | Model | 3634 | | Part Number | 3634 | | Power Source | Corded Electric | | Specification Met | UL | | Style | Handheld | | Style Name | Handheld | | UPC | 731413505775 | | Unit Count | 2305.0 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 - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord - Image 1](https://m.media-amazon.com/images/I/61g1sP6Lr4L.jpg) ![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord - Image 2](https://m.media-amazon.com/images/I/513TU5EjcAL.jpg) ![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord - Image 3](https://m.media-amazon.com/images/I/11SMC5vKLAL.jpg) ![OTC 3634 Heavy-Duty Straight Cord Circuit Tester - Designed for Testing Electrical Circuits and Locating Shorts, Grounds, and Open Circuits on 6V and 12V Systems; 5-Foot Cord - 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 ### ⭐⭐⭐⭐⭐ Would recommend *by C***B on May 1, 2026* Diesel mechanic for over 35 years. OTC has always been great quality tools. ### ⭐⭐⭐⭐⭐ Real tool for real work *by O***G on February 23, 2026* Was tired of Harbor Freight drop it once, and throw it out. This is the real tool for real work. ### ⭐⭐⭐⭐⭐ 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. ## 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 --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-designed-testing](https://www.desertcart.co.za/products/70254383-otc-3634-heavy-duty-straight-cord-circuit-tester-designed-testing) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-05-30*