How can I tell if the harness is burnt out?

The law of wire harness burnout is: in the power system circuit, where the iron is laid, where the wire harness burns, the junction between the burned and the intact part can be considered as the grounding of the wire harness, such as the wire harness burnt to the wiring of an electrical equipment. When the part is located, it indicates that the electrical equipment is faulty.

1) Burning the battery cable 1 If the battery cable only burns out a part, check the parts that come into contact with the cable burnout, and replace the battery line after cleaning the burr. 2 If the battery cable is completely burnt, the starter is faulty. The test light is connected to the electromagnetic switch + pole of the starter and the positive pole of the battery. If the test light is on, it indicates that the electromagnetic open circuit has a fault; if the test light is not lit, it indicates that the starter has a fault.

2) The harness between the generator + pole and the starter battery terminal burns out the generator, removes the lead of the generator + pole, connects a power line between the battery + pole, and the other end is in contact with the generator + pole. If a spark occurs, it indicates that the generator has failed. If there is no spark, it indicates that the harness is faulty.

3) Wire harness and relay lead burn out 1 Turn off the power switch, remove the relay, let it float, connect the test light between the relay case and the body. If the light is on, it indicates that the relay is faulty. If the light is not bright, perform the following steps. 2 Turn on the power switch. If the test light does not light, it means that the relay is not faulty. Only the wiring harness can be replaced. If the test light indicates that the relay is faulty, the relay should be replaced.