--- product_id: 15075440 title: "OTC 3642 Truck Electrical Circuit Tester - 12V-24V with 24 Foot Cord,Red" brand: "otc" price: "VT20928" currency: VUV in_stock: true reviews_count: 13 category: "Otc" url: https://www.desertcart.vu/products/15075440-otc-3642-truck-electrical-circuit-tester-12v-24v-with-24 store_origin: VU region: Vanuatu --- # 24 ft stretchable cord 12V-24V compatible 7-inch stainless steel probe OTC 3642 Truck Electrical Circuit Tester - 12V-24V with 24 Foot Cord,Red **Brand:** otc **Price:** VT20928 **Availability:** βœ… In Stock ## Summary > πŸ› οΈ Stretch your reach, not your patience β€” test smarter with OTC 3642! ## Quick Answers - **What is this?** OTC 3642 Truck Electrical Circuit Tester - 12V-24V with 24 Foot Cord,Red by otc - **How much does it cost?** VT20928 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/15075440-otc-3642-truck-electrical-circuit-tester-12v-24v-with-24) ## 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 - β€’ **Heavy-Duty Clamp:** Extra-large clamp grips bigger nuts and bolts for secure grounding every time. - β€’ **Trusted Pro-Grade Tool:** Join thousands of technicians who rely on OTC’s award-winning quality and durability. - β€’ **Ultra-Long Stretch Cord:** Reach every corner of your vehicle with a compact cord that extends up to 24 feet. - β€’ **Precision Stainless Probe:** 7-inch probe designed for accurate diagnostics in tight spaces. - β€’ **Powerful Dual Voltage Range:** Seamlessly test 12V to 24V truck electrical systems with confidence. ## Overview The OTC 3642 Truck Electrical Circuit Tester is a professional-grade diagnostic tool designed for 12V to 24V truck systems. Featuring a 7-inch stainless steel probe and an extra-long 24-foot coiled cord, it offers unmatched reach and precision. Its oversized clamp ensures secure grounding on larger components, making it an essential tool for technicians seeking reliable, efficient circuit testing. ## Description OTCs Truck Circuit Tester is designed for testing electrical circuits and locating shorts, grounds, and open circuits. For use on 12V - 24V systems. Versatile tester features a 7 inch long stainless steel probe and a red coiled cord that stays compact until you need more length then has the capability of stretching to a full 24 feet. The extra large clamp can be attached to larger nuts, bolts, and other grounds than a typical smaller clamp can. Value is at the core of the OTC tool and equipment portfolio. For a simple repair or the most complex drivability concern, these award-winning tools universally solve problems faster, and at better value, than any other product line available. Whether it’s a specialty tool or unique piece of service equipment, OTC provides top solutions to modern automotive service challenges while increasing technicians’ productivity and shop profits. Review: Quality test light - Great way to add a light load so your multi meter will read loaded voltage and not lie to you. Longer wire is also nice. From back of the dump truck to the cab! Overall great product. Review: Works - The long cord is really nice ## Features - OTCs Truck Circuit Tester is designed for testing electrical circuits and locating shorts, grounds, and open circuits - For use on 12V - 24V systems - Features a 7 inch long stainless steel probe - Red coiled cord stays compact until you need more length then has the capability of stretching to a full 24 feet - Extra large clamp can be attached to larger nuts, bolts, and other grounds than a typical smaller clamp ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B005J3KR92 | | Best Sellers Rank | #310,572 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #390 in Circuit Testers | | Brand Name | OTC | | Color | Red | | Customer Reviews | 4.6 4.6 out of 5 stars (187) | | Global Trade Identification Number | 00731413505805 | | Included Components | 12V–24V Truck Circuit Tester | | Item Dimensions | 13.9 x 2.1 x 0.1 inches | | Item Weight | 1 Grams | | Manufacturer | OTC | | Measurement Type | Voltmeter | | Minimum Operating Voltage | 12 Volts | | Model | 3642 | | Power Source | Battery Powered | | Style Name | Modern | | UPC | 731413505805 071090090493 012302669731 031112405643 971474694401 666661072208 012303704974 523161182243 | | Unit Count | 1.0 Count | | Warranty Description | 90 day Limited Warranty | ## Product Details - **Brand:** OTC - **Color:** Red - **Item Weight:** 1 Grams - **Power Source:** Battery Powered - **Style:** Modern ## Images ![OTC 3642 Truck Electrical Circuit Tester - 12V-24V with 24 Foot Cord,Red - Image 1](https://m.media-amazon.com/images/I/51ChZMSwn-L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Quality test light *by D***. on August 13, 2022* Great way to add a light load so your multi meter will read loaded voltage and not lie to you. Longer wire is also nice. From back of the dump truck to the cab! Overall great product. ### ⭐⭐⭐⭐⭐ Works *by T***X on January 3, 2026* The long cord is really nice ### ⭐⭐⭐⭐⭐ Great test light. Only one I use. *by B***N on August 19, 2017* My first one of these was a Matco branded one Same exact. That one Lasted for 10 years of steady use on trailers, trucks and excavators, until it lost connection in the coiled wire somewhere. Easily my favorite test light with Plenty of length to follow wires. Worth every penny. ## Frequently Bought Together - OTC 3642 Truck Electrical Circuit Tester - 12V-24V with 24 Foot Cord,Red - OTC 3634 Heavy-Duty Straight Cord Circuit Tester, Red - OTC 3633-10 Replacement Bulb, (Pack of 10) --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.vu/products/15075440-otc-3642-truck-electrical-circuit-tester-12v-24v-with-24](https://www.desertcart.vu/products/15075440-otc-3642-truck-electrical-circuit-tester-12v-24v-with-24) --- *Product available on Desertcart Vanuatu* *Store origin: VU* *Last updated: 2026-05-04*