5 Ways to Troubleshoot Wiring Harness Hitch Problems?

Grounding is an indispensable part of automobile wiring harness. Bad grounding will cause some strange faults in automobile power train, starting system, ignition system, instrument system, lights, etc. It is of great significance to quickly discover bad grounding faults and find the grounding location in time for the rapid elimination of related faults. The diagnosis methods of bad contact faults include: voltage drop detection, resistance detection, contact temperature detection, simulated vibration detection, etc.

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1. Poor wire contact When the battery is started, if the ground wire temperature is too high, the ground will even burn red, indicating that the ground wire of the battery is in poor contact. For old cars that have been used for many years, the iron parts have varying degrees of oxidation or corrosion. Even new cars are prone to poor grounding because they have been stored in the open parking lot of manufacturers or dealers for a long time. When there is no charge, the resistance value of the ground point can be measured. If there is resistance, it means that the ground is poor. 2. Use the simulated vibration method to inspect suspicious parts. You can gently shake the ground wire in the vertical and horizontal directions to simulate the vibration state of the vehicle while driving. At the same time, observe the reaction of relevant components to check whether the ground wire has false welding, looseness, poor contact or broken wires. If the fault reappears or disappears when moving a certain ground wire, it indicates that the unqualified position of the ground wire is here. 3. Measure the voltage drop. When the line is powered on, use a multimeter to measure the voltage drop at the ground point. The reading should be as low as possible. The specific method comprises the following steps: starting the engine, using the DC voltage block of the multimeter, making the red probe contact the output end of the generator, and the black probe contact the body to measure the voltage value, and the direct current voltage block of the multimeter is used to make the red probe contact the output end of the generator, and the black probe contact the body to measure the voltage value; Then, touch the metal part of the frame with a black probe, and then measure the voltage value. Under normal circumstances, the two values should be consistent. If the former value is large and the latter value is small, with a difference of more than 0.5 V, it means that there is a voltage drop above 0.5 V, which is caused by the poor overlap of the iron frame between the engine and the frame. Note: When the ground is detected at a certain point, the voltage of this point to the positive pole of the power supply should be measured, and the resistance of this point to the negative pole of the power supply should not be measured as much as possible, because the multimeter itself has a certain internal resistance, and the measured resistance value is large. 4. Test lamp inspection When a multimeter is used to detect the circuit, especially after the power cord and ground cord, it is best to use a loaded lamp for inspection, so as to avoid the electric trap of "voltage but no current". The grounding point is loose or corroded, resulting in poor grounding, which leads to various failures of vehicles. However, the grounding fault of automobile circuit is concealed, and it is not easy to find the fault. Some grounding points are even common grounding points of multiple circuits. Poor grounding in one place will affect the normal operation of several systems, so we must treat them correctly. When a bad grounding fault is diagnosed, you should refer to the relevant wiring diagram to quickly find the grounding point and eliminate the fault, which can often get twice the result with half the effort.

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