What is the best way to troubleshoot a bad wire harness hitch?

1. poor contact with the hitch wire after the starter motor operation, if the battery hitch wire temperature is too high, the hitch even has the phenomenon of burning red, indicating that the battery hitch wire contact is poor. For has been used for many years of the old car, its hitch parts are different degrees of oxidation or corrosion. Even new cars are prone to poor lap because they have been stored for a long time in the open parking lot of the manufacturer or dealer. You can measure the resistance value of the hitch point without electricity, if there is resistance, it means that the hitch is bad. 2. Using simulated vibration method to check the suspected parts, you can gently swing the hitch wire in the vertical and horizontal directions to simulate the vibration state of the car, and at the same time to observe the reaction of the relevant parts, to check whether there is a defective soldering of the hitch wire, loose, poor contact, or broken wires and other phenomena. If you move a hitch wire when the fault reappears or disappears, indicating that the hitch bad place here. 3. Measure the voltage drop in the circuit is energized state, using a multimeter to measure the hitch point voltage drop, the reading should be as low as possible. Specific method is: start the engine, use the DC voltage block of the multimeter, the red pen contact generator output, black pen contact engine body, measured a voltage value; then, with the black pen contact the metal part of the frame, and then measured a voltage value, under normal circumstances, these two values should be the same, if the former value is large, the latter value is small, the difference of 0.5V or more, indicating the existence of 0.5V If the former value is large and the latter value is small with a difference of more than 0.5V, it means that there is a voltage drop of more than 0.5V, which is caused by the poor iron between the engine and the frame. Note: When detecting a certain point of the hitch, you should measure the voltage of the point on the positive pole of the power supply, and try not to measure the resistance of the point on the negative pole of the power supply, which is because the multimeter itself has a certain internal resistance, and the measured resistance is larger. 4. test lamp inspection in the use of multimeter testing circuit, especially after the power line and the hitch line, it is best to use the test lamp with load to verify, so as to avoid the production of "Voltage without current" electrical traps. Modern cars have up to dozens of hitch points throughout the body, these hitch points may be due to loose or corrosion generated hitch bad, causing a variety of vehicle failures. But the car circuit hitch fault hidden strong, fault is not easy to find. Some of the hitch points and even multiple circuits of the common hitch point, a bad hitch will affect the normal operation of several systems, we must be treated correctly. Once diagnosed as a bad lap iron failure, you should refer to the circuit diagram to quickly find the lap iron point and to be eliminated, which can often get twice the result with half the effort.

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