Find Short Circuits And Hidden Wire Breaks In Seconds With The TesiLoci Automotive Circuit Tester

Equipped with an advanced Sender, a highly sensitive Receiver, a 15-inch flexible coiled steel probe, an intelligent directional indicator, and safe 6V to 42V DC protection — the TesiLoci locates faults behind panels, under carpets, and through conduits without stripping or damaging a single wire.

Tired Of Stripping Insulation And Dismantling Panels Just To Find A Break?

The TesiLoci operates right through standard wire insulation, allowing you to trace cables and find open circuits in tight bundles and hidden walls without any physical damage to the protective sheath — saving hours of unnecessary teardown on every diagnostic job.

Frustrated By Intermittent Issues That Vanish On The Hoist?

With the TesiLoci's flexible coiled steel probe you can flex wires, connectors, and harnesses while listening to tone changes in the receiver. The moment the pitch changes, you have located the intermittent fault, current leak, or bad ground without the headache.

Need A Versatile Tool That Spans Classic Autos, Heavy Trucks, And RVs?

TesiLoci covers the full range from legacy 6V systems to modern 42V hybrid vehicles, handling passenger cars, boats, tractors, commercial trucks, and complex RV electrical networks — all with one powerful diagnostic system.

• Non-Destructive Tracing Through Wire Insulation Without Cutting
• Intelligent Directional Indicator Points Directly To The Short
• 15-Inch Flexible Coiled Steel Probe For Tight Engine Bays
• Internal Surge And Overload Protection For ECU-Safe Operation

WHY CHOOSE TESILOCI

NON-DESTRUCTIVE INSULATION TRACING

Trace and identify cables without puncturing or stripping insulation, protecting sensitive circuits from future rust or corrosion while saving significant time on every diagnostic job in any workshop.

INTELLIGENT DIRECTION INDICATOR

The built-in directional LEDs guide you precisely toward the short circuit, eliminating guesswork and pointing you straight to the fault location without aimlessly scanning entire wiring harnesses.

SAFE 6V TO 42V PROTECTION

Internal surge and overload protection allows safe testing across classic 6V systems, standard 12V vehicles, and next-generation 42V hybrids without any risk of damaging delicate ECUs or electronic components.

15-INCH FLEXIBLE STEEL PROBE

The long coiled steel probe bends effortlessly into crowded engine bays, under seats, behind trim panels, and through tight conduit runs where standard probes cannot physically reach.

TONE CUSTOMIZATION SYSTEM

Send a single solid tone or dual alternating tones along target cables to make tracing across complex multi-wire bundle pathways faster, clearer, and more reliable in any diagnostic scenario.

MULTI-SYSTEM DIAGNOSTICS

Verify wire continuity, locate open connections, analyze telephone line states, and track automotive wiring harnesses — all with one powerful sender and receiver system that covers every diagnostic need.

MEET THE TESILOCI

Frequently Asked Questions

How does the TesiLoci find short circuits without damaging the insulation?

The Sender generates a safe tone signal that travels down the cable. The Receiver detects this frequency through the wire jacket, letting you track the exact route and find shorts through sound changes without cutting or stripping any copper.

What voltage systems can this circuit tester operate on?

It works on all DC voltages from 6V to 42V, covering legacy vehicles, modern passenger cars, commercial trucks, tractors, boats, RVs, and next-generation 42V hybrid electrical systems.

Is it safe to use around sensitive vehicle computers and ECU circuits?

Yes. The TesiLoci features internal surge and overload protection specifically designed to prevent damage to delicate electronic components and automotive processors during standard tracing operations.

What are the physical dimensions of the handset?

The main tracking handset is 17cm long and 4cm wide, and comes equipped with a highly durable flexible 15-inch coiled steel probe for reaching tight spaces.

What batteries does this circuit tester require?

The TesiLoci requires two standard 9V batteries — one for the Sender unit and one for the Receiver unit. These are not included in the package.

How does the directional indicator feature work?

When hunting for a short circuit, the receiver's directional LEDs show exactly which direction to scan along the wire, guiding you directly toward the fault and eliminating frustrating back-and-forth guesswork.

Can it be used on household lines or telephone cables?

Yes, it is highly versatile. It detects tone signals on telephone lines, judges continuity on signal cables, and identifies line states including clear, ringing, and busy, making it useful beyond automotive applications.

What is included?

Your TesiLoci comes with the Sender unit, Receiver unit with flexible coiled steel probe, storage case, and user manual.