8 pin PB625-08020 Auto Vehicle Plug Connector Lamp Headlight Socket For Audi BMW Ford

(2) Direivation and resistance
① Disgle the battery terminal or wiring so that there is no voltage between the checkpoint.
② Use the two wires of the Ohm watch to check the two ends.
9.4 Short -circuit fault search
(1) Short -circuit of the ground line on the ground refers to the ground ground caused by damage damage.
The wire ground causes the fuse or melting connection. If there is no fuse, the circuit can burn or even get angry. If the short circuit occurs after the load, the circuit control device may lose its effect. At this time, the test light is very important. Place the test light in the fuse position and disconnect the circuit element in order and reasonably. If the test light is extinguished, you can find the failure of the circuit.
Figure 9-4-1 Wire beam short circuit
(2) For short -circuit power supply short circuit, the wires caused by insulation damage are touched with another circuit wire. This will make the circuit run abnormally, there are some strange phenomena and it is not easy to find. To detect such problems, you must observe signs and identify relevant circuits. Dushing insurance at this time helps to find relevant circuit branches, and then check the voltage and resistance in key parts, so that the fault will be found.
(3) Excessive vehicle circuit resistance failure detection and maintenance resistance is often the most difficult fault. At this time, the detection instrument is very important. Plugs are loose, dirty, or corrosive can cause excessive resistance and reduce current, resulting in dim light, flashing or component failure.
As a kind of failure, excessive resistance refers to the indicator of the resistance in any circuit that exceeds its original design. Excessive resistance is often caused by corrosion, loosening and insufficient contact area of the wiring end, joints and ground wires. Excessive resistance can also occur inside the part.
Excessive resistance makes the circuit load, and the additional load in the circuit will reduce the power supply of other loads in the circuit. When the resistance is too high, the lights will become darker and the motor speed slows will occur. In more severe cases, high resistance is like a disconnection. If the ground wire wiring is corroded, this ground wire (the resistance should be zero) will not work all the loads on this circuit due to its excessive resistance.
Excessive resistance of the joints, wiring end and ground wires is often caused by water, butter and dirty by water, snow -soluble salt and the oil, butter and dirty. The load can also be too high due to internal damage, wear, overload or vibration. The resistance inside this type of component is too high, as damaged inside the part, it is difficult to find it with the naked eye. Some of the connections, wiring end, and ground are visible, but some cannot be seen, but some cannot be seen. At this time, the test instrument must be checked.

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