Introduction to Circuits

According to statisticscarCircuit failures account for 70% of the failure rate. Knowing a little about car circuits is like holding a talisman. Traveling north and south is more unimpeded.

Single-wire parallel circuit. Generally, automobile circuits are single-wire parallel circuits. The positive wire (commonly known as the live wire) of most circuits isfuseThe box is connected, the negative wire (commonly known as the ground wire) is shared, there are three important nodes, the fuse box,RelayAnd combinationswitch.

Turning complexity into simple crisscross car circuits are actually made up of various circuits superimposed, and each circuit can be listed separately, turning complexity into simplicity. The whole vehicle circuit can be divided into light, signal, instrument, start, ignition, charging and other circuits according to the purpose. Each circuit has its own wire connected to the control switch or fuse box.

Grab one end of the most common wires to connect a fuse or switch, and the other end to connect a relay or electrical equipment. For example, the headlight circuit is divided into two chromiums, one is the power supply branch, namely the fuse box (positive line)—>headlight relay—>headlight—>the ​​negative line, and the other is the control branch—the fuse box—>combination switch—> Headlight relay —> negative wire. Other elephant lights, brake lights,Turn signal, Carriage lights,WiperThe circuits of other electrical equipment are also basically similar.

Find the key. Generally, the fuse box and the relay on the car are placed in the same place for easy inspection. Also understand the function of the combination switch, especially the role of each branch on the combination switch connector. If you know the functions and positions of the three important nodes, such as the fuse box, the relay, and the combination switch, it will be easier to get started by studying and comparing the relevant automotive electrician books.