Why you need this tool Quickly find electrical faults and verify connections so you can diagnose and repair automotive wiring with confidence. The unit pinpoints shorts, checks lights, and tests continuity without repeatedly swapping fuses or guessing where the problem is. Key benefits and how it solves problems Accurate diagnostics: Trace short circuits, confirm continuity, and test lamp circuits to identify the root cause rather than chasing symptoms. Safer testing: Built-in short circuit protection and a 6–24V DC test range reduce risk during troubleshooting and help prevent damage to vehicle electronics. Faster repairs: A long test lead (about 16 feet) lets you reach components throughout the vehicle without constantly re-routing or repositioning, saving time and effort. Simple operation: Connect the unit to the vehicle battery, use the power button to test, and instantly check for positive and negative currents or poor ground connections. Important specifications and attributes Function: Locate/trace short circuits, check lights, test continuity, detect poor ground connections, and check positive/negative currents. Compatibility: Designed for automotive electrical systems operating within 6–24V DC. Size/lead length: Long test lead — approximately 16 feet — for extended reach around trucks, cars, and service bays. Safety features: Short circuit protection built into the unit for safer diagnostics. Performance: Instant detection of poor grounds and clear pass/fail testing via the power toggle for quick decision-making. Typical use scenarios 1. Replace a blown tail light: Use the tool to trace the tail light circuit, find the short or broken connection, and verify continuity after repair. 2. Install aftermarket electronics: Confirm fuses, test accessory power points, and ensure proper grounding before connecting a new stereo or backup camera. 3. Trailer and towing checks: Reach wiring at the rear of trucks or trailers with the long cable to quickly verify light circuits and ground integrity before a trip. How to use Attach the unit to the vehicle battery. Toggle the power button to begin testing. Probe circuits to check for continuity, shorts, light operation, or poor ground connections. Use the long lead to access hard-to-reach connectors without moving the vehicle or components. This tool provides reliable, straightforward electrical testing for 6–24V automotive systems, combining safety features, extended reach, and simple operation to make routine diagnostics faster and more accurate.