Key benefits Fast, accurate troubleshooting for 12V vehicle electrical systems — find shorts, bad grounds, and open circuits without guessing. Safe to use in DC automotive environments: built-in short-circuit protection and 6–24V DC testing range reduce risk and avoid exposing systems to AC voltage. Extended reach for easier access: the test lead is approximately 16 feet, so you can work around the vehicle without constantly moving equipment. What this tool does Locates and traces short circuits in wiring harnesses and lighting circuits. Tests continuity for switches, fuses, and connectors. Checks lights and other 6–24V DC components. Detects poor ground connections without using AC voltage. Allows quick polarity checks: toggle the power button to verify positive and negative currents. Key features and specs Voltage compatibility: 6–24V DC (suitable for most automotive and light truck systems). Safety: built-in short-circuit protection to reduce the chance of damage during diagnostics. Lead length: test lead of about 16 feet for convenient reach around the vehicle. Operation: connects to the vehicle battery for straightforward testing; power toggle lets you instantly check polarity and current flow. How to use Connect the unit to the vehicle battery as instructed. Use the probe on wiring, connector pins, lamp sockets, fuses, or chassis ground points. Toggle the power button to observe polarity and confirm whether a circuit is live, open, or grounded. Rely on the short-circuit protection to help prevent accidental damage while probing. Practical use scenarios Tail light diagnosis: trace a short or intermittent circuit in rear lighting without removing the harness; test lamp sockets and continuity through connectors. Starter/ignition troubleshooting: check continuity through ignition switches and relays and verify proper grounds in the engine bay. Door and accessory wiring: locate a broken conductor or poor ground in door wiring, power windows, and aftermarket accessories using the long test lead for easier access. Why customers choose this tool Designed specifically for DC automotive systems with clear compatibility (6–24V DC). Long lead and simple battery connection make on-vehicle diagnostics faster and less cumbersome. Built-in protection and polarity checking reduce risk and simplify troubleshooting steps. Contents and compatibility note Intended for automotive electrical diagnostics; use only on 6–24V DC circuits. Do not use on AC or high-voltage systems.