What is the fault phenomenon of poor contact of automobile battery? Will the idle speed be unstable?

Yes, it may cause the car to fail to start normally, damage the car battery, and may also cause the generator to be damaged.

What is the main connection between the battery and the car body? This is a thick power grounding wire, which is usually connected to the frame of the car. This wire absorbs the current of all parts of the car. Because the battery pile head is easy to corrode and sulfide, this kind of grounding wire often has poor contact with the battery. The engine is difficult to start, the lights are dim, the starter can't start, and the whole car is in a state of no electricity, which causes the above problems. When the car is low in power and is suspected of poor grounding, it is usually the easiest to check from this line, which often gets twice the result with half the effort.

Ground wire between engine block and battery? The engine is the heart of the car and the most important and concentrated part of the electrical mechanism. There are generators, starters, ignition systems, fuel supply systems and various sensors. In general, the engine is not directly connected with the body metal. It should be installed on the automobile body through rubber pads to reduce vibration. The engine grounding wire is not good, the starter and generator are not working normally, the sensor can't sense accurate signals, and the spark plug can't ignite strong sparks, which directly affects the engine power. Sparks will appear where the grounding point is loose, and the arc will burn the parts. Whether the grounding of the engine is good or not cannot be ignored.