Helps locate short circuit
How to use: 1, Locate burned fuse 2, Select proper fuse size: Normal, Mini, Mini low, Micro2 3, Connect devise to burned fuse place 4, Give ignition, engine RUN if fault located in ignition/Injection 5, Normal Sound 18 DB no short circuit 6, Move/Touch wiring harness until LOUD Sound 30 DB come IF LOUD sound come, you have located wire harness short circuit location. Check wire harness insulation and repair! May you can have a defective parts, Dashboard, ECM/ECU etc... If you disconnect device, and signal has become quieter, than you found defective part.