Composition of harness:
1. In order to facilitate installation and maintenance and ensure that the electrical equipment can work under the worst conditions, the electrical equipment of different specifications and colors used in the whole vehicle
The wires shall be integrated through reasonable arrangement, and the wires shall be bundled with insulating materials, so as to be complete and reliable.
2. Normal selection of wire cross-sectional area and color code
1) Correct selection of wire sectional area
The electrical equipment on the vehicle selects the cross-sectional area of the wires according to the load current. For electrical equipment working for a long time, the actual current carrying capacity of the wire can be selected
60%； 60% - 100% of the actual current carrying capacity of the wire can be used for electrical equipment working for a short time.
2) Selection of wire color code
In order to facilitate identification and maintenance, the wires in the wire harness have different colors.
For the convenience of marking in the circuit diagram, the colors of the wires are all represented by letters, and the colors represented by them are noted in each circuit diagram.
Common faults of automobile harness include poor contact of connector, short circuit, open circuit, grounding, etc.
The causes are as follows:
1) Natural damage
The use of wire harness has exceeded the service life, aging the wire, breaking the insulation layer, and significantly reducing the mechanical strength, causing short circuit, open circuit, grounding, etc. between wires, resulting in electricity
The harness is burnt out.
2) Damage to wire harness due to failure of electrical equipment
In case of overload, short circuit, grounding and other faults of electrical equipment, the wire harness may be damaged.
3) Human error
When assembling or repairing automobile parts and components, metal objects will crush the wire harness and break the insulation layer of the wire harness; The positive and negative leads of the battery are connected reversely; Repair circuit fault
When connecting or cutting the wires of the wire bundle, etc. in disorder, the abnormal operation of the electrical equipment can be caused.
1. In order to facilitate installation and maintenance and ensure that the electrical equipment can work under the worst conditions, the electrical equipment of different specifications and colors used in the whole vehicle
The wires shall be integrated through reasonable arrangement, and the wires shall be bundled with insulating materials, so as to be complete and reliable.
2. Normal selection of wire cross-sectional area and color code
1) Correct selection of wire sectional area
The electrical equipment on the vehicle selects the cross-sectional area of the wires according to the load current. For electrical equipment working for a long time, the actual current carrying capacity of the wire can be selected
60%； 60% - 100% of the actual current carrying capacity of the wire can be used for electrical equipment working for a short time.
2) Selection of wire color code
In order to facilitate identification and maintenance, the wires in the wire harness have different colors.
For the convenience of marking in the circuit diagram, the colors of the wires are all represented by letters, and the colors represented by them are noted in each circuit diagram.
Common faults of automobile harness include poor contact of connector, short circuit, open circuit, grounding, etc.
The causes are as follows:
1) Natural damage
The use of wire harness has exceeded the service life, aging the wire, breaking the insulation layer, and significantly reducing the mechanical strength, causing short circuit, open circuit, grounding, etc. between wires, resulting in electricity
The harness is burnt out.
2) Damage to wire harness due to failure of electrical equipment
In case of overload, short circuit, grounding and other faults of electrical equipment, the wire harness may be damaged.
3) Human error
When assembling or repairing automobile parts and components, metal objects will crush the wire harness and break the insulation layer of the wire harness; The positive and negative leads of the battery are connected reversely; Repair circuit fault
When connecting or cutting the wires of the wire bundle, etc. in disorder, the abnormal operation of the electrical equipment can be caused.
