Find Short Circuits & Hidden Wire Breaks in Seconds Without Damaging Insulation!
Stop the diagnostic guesswork. The TesiLoci Automotive Circuit Tester lets you quickly trace wire bundles, pinpoint open circuits, and find shorts instantly across any 6V to 42V DC system—saving you valuable time and boosting your repair income.
- 6V to 42V Ready for Cars, Trucks, Tractors, Boats & RVs
- Trace Wires Behind Panels, Under Carpets, and In Conduits
- Intelligent Direction Indicator Points Directly to the Short
- Internally Protected Against Surges and Power Overloads
-50%
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Get Your TesiLoci Circuit Tester NowTRUSTED BY PROFESSIONAL MECHANICS & AUTO ELECTRICIANS
Find Hidden Electrical Faults Instantly Without Stripping or Puncturing Wires.
Tired of stripping insulation and dismantling panels just to find a break?
Traditional diagnostic tools require you to tear up carpets, remove interior upholstery, and split open wire conduits. TesiLoci operates right through standard insulation, allowing you to trace cables and find open circuits in bundles or tight walls without any physical damage to the protective sheath.
Frustrated by tracing intermittent issues that vanish on the hoist?
With TesiLoci's flexible coiled steel probe, you can easily flex wires, connectors, and harnesses while listening to changes in the receiver's tone. The moment the tone pitch changes, you have located your intermittent fault, current leak, or bad ground without the headache.
Need a versatile tool that spans classic autos, heavy trucks, and RVs?
TesiLoci is engineered for standard automotive work and next-generation 42V systems. With its robust working voltage range of 6V to 42V DC, you can seamlessly transition from passenger cars and boats to tractors, commercial trucks, and complex RV electrical networks.
Over 10,000 Professional Mechanics and DIYers Save Hours of Diagnostic Work with TesiLoci.
"The TesiLoci circuit tester is a complete game changer for professional workshops and DIY garages. By sending a precise tone signal directly along the cables, it allows you to trace short circuits under carpets and dashboard panels in minutes, completely protecting fragile vehicle ECUs from damage."
– Marcus Thorne, Lead Automotive Electrical Engineer
WHY CHOOSE TESILOCI
Why Mechanics and Electricians Trust TesiLoci Daily.
TESILOCI DELIVERS FAST, PINPOINT DIAGNOSTICS WITHOUT DAMAGING INSULATION:
Non-Destructive Tracing
Trace and identify cables or wires without puncturing or stripping the insulation, protecting sensitive circuits from future rust or corrosion.
Directional Indicator
Features an intelligent built-in direction indicator to guide you exactly toward the short, eliminating complex electrical guesswork.
Safe 6V to 42V Protection
Internally protected against power surges, voltage spikes, and overloads. Safely test classic 6V systems or standard 12V and 42V hybrid vehicles.
15-Inch Coiled Steel Probe
The long, flexible coiled steel probe bends easily, helping you reach wires buried deep within crowded engine bays, under seats, and behind trims.
Tone Customization
Easily send a single solid tone or dual alternating tones to the target cables, making tracing across bundle pathways simpler than ever.
Multi-System Diagnostics
Verify wire continuity, locate open connections, analyze telephone line states (clear, ring, busy), and track automotive wiring—all with one powerful system.
TESILOCI IN ACTION
What is inside the TesiLoci Box?
Automotive Circuit Tester
User Manual
24/7 Expert Technical Diagnostic Support
Your garage operations must keep moving. Our dedicated technical support team is standing by 24/7 to assist with usage instructions, vehicle connection diagrams, and troubleshooting guidelines to ensure your diagnostic tasks run perfectly.
DISCOVER TESILOCI
Frequently Asked Questions
TOP #1 AUTOMOTIVE DIAGNOSTIC CABLE LOCATOR
Loved by Mechanics, Fleet Technicians, and DIY Garage Builders Globally
Marcus Vance
This tester completely streamlined my shop's diagnostics! Finding shorts under dashboards is usually a nightmare, but TesiLoci pinpointed the break under the rear panel carpet in under 5 minutes without tearing anything apart.
VERIFIED BUYER
Evelyn Reed
Super durable coiled steel probe. I work on heavy fleet trucks, and standard multimeters are useless for tracing inside tight wire bundles. TesiLoci tracks the signal through thick conduit with perfect tone feedback.
VERIFIED BUYER
Sarah Jenkins
I used this to solve an intermittent battery drain in my camper. Flexing the wire bundle and listening for the audible frequency changes highlighted the short immediately. Highly recommended tool for any DIYer.
VERIFIED BUYER