Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group

The Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group is a crucial component of the tractor truck’s electrical system. This wiring harness group is meticulously designed to ensure seamless electrical connectivity across various cab components. It integrates numerous elements such as body harness assemblies, relay boxes, fuse boxes, and a multitude of connectors and fasteners, all crucial for the operational efficiency of the vehicle.

Product Parameters of Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group

Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
Components Overview
LH and RH Body Harness Assemblies
LH Body Harness Assembly: This assembly is essential for routing electrical signals on the left-hand side of the tractor cab. It connects various controls and switches, ensuring that the left-hand side components function correctly.
RH Body Harness Assembly: Similarly, the RH body harness assembly serves the right-hand side of the cab. It plays a vital role in connecting and managing the electrical circuits on the right side.
Relay and Fuse Boxes
Relay Box: Positioned strategically within the cab, the relay box houses multiple relays crucial for controlling high-current circuits. Each relay in this box is responsible for different functions, from headlights to auxiliary components.
Fuse Box: The fuse box provides protection to the electrical circuits by housing fuses that prevent overcurrent situations. It is essential for safeguarding various electrical components and ensuring the reliability of the electrical system.
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
Harness Guards and Binding Tape
Harness Guards: These protective covers shield the wiring harnesses from physical damage and environmental factors. They ensure longevity and reliability by preventing wear and tear.
Binding Tape: Used for securing and organizing the wiring harnesses, binding tape ensures that the cables remain bundled together, minimizing the risk of abrasion and tangling.
SMJ Covers and Boxes
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
SMJ Cover (Left and Right): The SMJ covers protect the connectors at the junctions where wiring harnesses connect. They play a significant role in preventing dust, moisture, and other contaminants from affecting the electrical connections.
SMJ Box (Left and Right): These boxes serve as central connection points for the wiring harnesses. They ensure that electrical signals are transmitted efficiently between various components.
Fasteners and Brackets
Bolts, Nuts, and Washers: These are essential for securely attaching various components of the wiring harness group. They ensure that all parts are firmly fixed, preventing any movement or disconnection that could lead to malfunction.
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
Brackets: Specifically designed to hold components like the ABS diagnostic interface in place, brackets ensure that critical diagnostic equipment remains securely mounted.
Connectors and Wiring Paths
To LH Door Harness: This connector links the main body harness to the door harness on the left side, enabling various door functions such as windows and locks.
To Headlining Harness: This connection integrates electrical components located in the headlining area, including overhead lights and other features.
To Combination Switch: This switch is responsible for controlling multiple functions from a single point, such as turn signals and wipers.
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
To Hazard Warning Switch (Yellow): This switch activates the hazard lights, crucial for alerting other drivers of potential issues.
To Preheat Switch (Brown): This switch is used to preheat the engine or other components before starting, ensuring optimal performance in cold conditions.
Special Function Switches
To Switch of Air and Electric Horns (Green): This switch controls both the air and electric horns, essential for signaling other drivers.
To Dryer Switch (Black): Used for operating the air dryer system, this switch ensures that the air system remains clean and efficient.
To Rear Lamp Switch (Blue): This switch controls the rear lamps, ensuring proper visibility at the back of the tractor truck.
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
To ABS Flashing Code Diagnosis Switch (Red): This diagnostic switch helps in reading and troubleshooting ABS system codes, crucial for maintaining the braking system.
Relays for Various Functions
To Left Turning Ground Lamp Relay (Blue): Controls the ground lamp for left turns, enhancing safety during turns.
To Right Turning Ground Lamp Relay (Blue): Similar to the left turning relay, but for the right side.
To ACC Relay (Blue): Manages the accessory power, ensuring that additional electrical accessories receive proper power.
To Ignition Lock ON Relay 1 and 2 (Blue): These relays control the ignition system, ensuring that the engine starts and runs correctly.
To Rear Fog Lamp Switch Relay (Blue): Manages the rear fog lamps, improving visibility in foggy conditions.
Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group
Miscellaneous Connections
To Radio & CD Player: Connects the cab’s audio systems for entertainment and communication.
To Cigar Lighter: Provides power to the cigar lighter, which can be used for various electrical accessories.
To Floor Upper Harness: Integrates wiring for the upper portion of the floor area, ensuring connectivity for underfloor components.
Conclusion
The Dongfeng DFL4251A8-T31R-931-02 Series Tractor Truck Cab Wiring Harness Group is an intricate assembly designed to meet the complex electrical demands of modern tractor trucks. By integrating essential components such as body harnesses, relay and fuse boxes, and a variety of switches and connectors, this wiring harness group ensures that the tractor truck’s electrical systems operate seamlessly. Proper installation and maintenance of this harness group are crucial for the reliable and efficient performance of the vehicle.

Serial No.	Part No.	Part Name	Qty.
1	10932400	LH body harness assembly	1
	10087100	Relay box	1
	10369300	Fuse box	1
	10080900	Harness guard	1
	10081000	Harness guard	1
	10084800	Binding tape	7
2	10370600	SMJ cover- left	1
	10082800	Clamp- SMJ to fix wiring harness	1
3	Q32206	Nut	1
	Q32006	Nut	3
	Q1840612	Bolt	1
	Q41106	Washer	1
4	10370500	SMJ box- left	1
	Q1840620-F7	Bolt	2
	Q32006-F7	Nut	4
5	10932500	RH body harness assembly	1
	10087100	Relay box	1
	10369300	Fuse box	1
	10369700	Harness guard	1
	10369800	Harness guard	2
	10084800	Binding tape	3
	Q1840612	Bolt	1
	Q41106	Washer	1
6	10370700	SMJ cover- right	1
	Q32006	Nut	4
	Q1840620-F7	Bolt	2
	Q32006-F7	Nut	4
7	10370800	SMJ box- right	1
	10082800	Clamp- SMJ to fix wiring harness	2
	10081200	Bracket- ABS diagnostic interface	1
	RQ2710312	Self tapping screw	3
	Q32005	Nut	1
	10076600	Binding tape	1
		(1)- To LH door harness
		(2)- To Headlining harness
		(3)-To Combination switch
		(4)-To Hazard warning switch(yellow)
		(5)-To Preheat switch(brown)
		(6)-To Switch of air and electric horns(green)
		(7)-To Dryer switch(black)
		(8)-To Rear lamp switch(blue)
		(9)-To ABS flashing code diagnosis switch(red)
		(10)-To Left turning ground lamp relay(blue)
		(11)-To Right turning ground lamp relay(blue)
		(12)-To ACC relay(blue)
		(13)-To Ignition lock ON relay 2(blue)
		(14)-To Rear fog lamp switch relay(blue)
		(15)-To Small lamp relay(blue)
		(16)-To Ignition lock ON relay 1(blue)
		(17)-To Front Fog Lamprelay(blue)
		(18)-To Horns relay
		(19)-To High relay
		(20)-To Dip relay
		(21)-To Brake lamp relay
		(22)-To Fuse box
		(23)-To Axial differential switch(yellow)
		(24)-To Wheel side differential switch(black)
		(25)-To Radio & CD player
		(26)-To RH body harness
		(27)-To Cigar lighter
		(28)-To Left frame harness
		(29)-To Front wall harness
		(30)-To Ground short circuit plug2
		(31)-To Ground short circuit plug1
		(32)-To Diode assembly
		(33)-To Fuel preheat relay
		(34)-To Flasher unit (ash)
		(35)-To Integrated alarm
		(36)-To Floor upper harness
		(37)-To Electric accelerator pedal
		(38)-To Brake lamp switch(blue)
		(39)-To Combination switch(white porcelain)
		(40)-To Ignition lock(blue)
		(41)-To Combination switch(white porcelain)
		(42)-To Clutch switch(blue)
		(43)-To Rear fog lamp switch
		(44)-To Ceiling lamp switch(black)
		(45)-To Front fog lamp switch
		(46)-To Left lower floor harness(blue)
		(47)-To Ground
		(48)-To LH body harness
		(49)-To Wiper intermittent relay
		(50)-To Multi,function buzzer
		(51)-To Lowerha rness of RH floor(blue)
		(52)-To Electric control system diagnostic interface
		(53)-To ABS control unit
		(54)-To Wiper motor(blue)
		(55)-To Ground
		(56)-To RH door harness(blue)
		(57)-To Right frame harness
		(58)-To Trailer ABS(red)
		(59)-To Ground short circuit plug
		(60)-To Frame harness(black)
		(61)-To A/C and heater harness(blue)
		(62)-To Reverse lamp relay(blue)
		(63)-To Brake switch relay(black)
		(64)-To Compressor accessories relay(blue)
		(65)-To Heater accessories relay(blue)
		(66)-To Wiper attachment relay(blue)