1) Inspection of the wiring After the wiring harness replacement is completed, first check whether the wiring harness connector is correctly connected to the electrical equipment, and whether the battery positive and negative poles are correctly connected.
2) The ground wire of the test battery can be temporarily disconnected. Use a 12V, 20W light bulb as the test light, connect the test light in series between the negative electrode of the battery and the ground end of the frame, and turn off all electricity on the car. Device switch. Normally, the test light should not be on, otherwise the circuit is faulty. When the circuit is normal, remove the light bulb, use a fuse with a capacity of 30A, connect in series between the negative electrode of the battery and the grounding end of the frame, do not start the engine, and turn on the power of each electrical equipment on the vehicle one by one. And line inspection, after confirming that the electrical equipment and lines are fault-free, remove the fuse and connect the battery ground wire.