Electrical Equipment In The Cab: Deconstructing 49 Critical Parts for Flawless Operation

This is a comprehensive technical guide to the Electrical Equipment In The Cab for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This deconstruction details the 49 serviceable component types, from the main instrument cluster and wiring harnesses to the various controllers, switches, and relays.

The Electrical Equipment In The Cab is the central nervous system and operator interface for the entire vehicle. It is a complex network of wiring, modules, switches, and sensors that control every function, from the engine ignition and brake lights to the instrument readouts and power windows. For a heavy-duty dump truck, this system must be exceptionally robust to withstand constant vibration, dust, and moisture.

This deconstruction will analyze the key serviceable systems of the Electrical Equipment In The Cab, including the main wiring harnesses, the driver control modules (like the instrument cluster and combination switch), the fuse and relay box, and all ancillary components. A fully functional Electrical Equipment In The Cab is critical for vehicle operation, diagnostics, and driver safety. We will explore every part of this Electrical Equipment In The Cab module.

Core 1: The “Driver Interface” Logic (Controls & Readouts)

This group forms the primary components of the Electrical Equipment In The Cab that the driver directly interacts with. These are the main touchpoints for vehicle control and information.

1. Component: ‘Instrument cluster assy’ (3820010A61B) – Qty 1
This (Comp 44) is the driver’s main information source. This complex module integrates all the vehicle’s gauges (speed, RPM, air pressure, fuel, temperature) and warning lights into a single unit. It is the “face” of the Electrical Equipment In The Cab and is critical for safe operation.

2. Component: ‘Combination switch assy’ (3735010C61B) – Qty 1
This (Comp 30) is the multi-function stalk assembly located on the steering column. The Driver Control Logic is centralized here: this single unit typically controls the turn signals, high/low beam headlights, and windshield wipers. It is one of the most frequently used parts of the Electrical Equipment In The Cab.

3. Component: ‘Ignition switch assy’ (3704010-A01) – Qty 1
This (Comp 1) is the main key switch. It provides electrical power to all circuits of the Electrical Equipment In The Cab, including “Accessory,” “On,” and “Start.” This is the master switch for the entire vehicle’s electrical system.

4. Component: ‘Radio/media player assy’ (7901010A61B) & Speakers (7901015-A01, 7901020-A01)
This (Comp 46, 47, 48) is the in-cab entertainment and information system. It includes the main ‘Radio/media player’ (Comp 46) and the ‘Left’ (Comp 47) and ‘Right’ (Comp 48) ‘full-range speaker’ assemblies. This part of the Electrical Equipment In The Cab is essential for driver comfort and communication.

Core 2: The “Nervous System” Logic (Main Wiring Harnesses)

This group is the “nervous system” of the Electrical Equipment In The Cab. These harnesses are large, complex, custom-loomed bundles of wires that transmit power and data signals to every component.

1. Component: ‘Instrument wiring harness assy’ (3724010A14B) – Qty 1
This (Comp 13) is the dedicated harness that connects *to* the ‘Instrument cluster’ (Comp 44). It gathers signals from all over the truck (speed, temperature, pressure) and delivers them to the gauges.

2. Component: ‘Body wiring harness assy’ (3724020MA01) & ‘Right body’ (3724025MA01)
This (Comp 14, 15) is the largest and most complex harness in the Electrical Equipment In The Cab. It runs through the dashboard, along the floor, and to the rear of the cab, connecting the fuse box, switches, lights, and controllers. A fault in this main harness is often difficult to diagnose and repair.

3. Component: ‘Left/Right door wiring harness assy’ (3724030CA01, 3724035CA01)
This (Comp 16, 17) is the harness that runs from the cab body, through a flexible boot, and into the doors. This part of the Electrical Equipment In The Cab is responsible for powering the ‘Power window switches’ (Comp 35, 36) and ‘Speakers’ (Comp 47, 48).

4. Component: ‘Function switch harness’ (3724080B14B) & ‘Overhead console harness’ (3724085DA01)
This (Comp 18, 19) are sub-harnesses for specific functions. The ‘Function switch’ harness likely connects to the dashboard switches, while the ‘Overhead console’ harness powers interior lights and other roof-mounted items. This modular design simplifies the main Electrical Equipment In The Cab.

Core 3: The “Control Module” Logic (The Brains)

This group represents the “brains” of the Electrical Equipment In The Cab. These are the electronic modules that take inputs from sensors and switches and make decisions to control vehicle functions.

1. Component: ‘Fuse box assy with relay’ (3722065QA01) – Qty 1
This (Comp 10) is the central power distribution and protection hub. The Protection Logic is that it houses all the main fuses and relays. If a short circuit occurs, a fuse will blow, protecting the expensive wiring and modules of the Electrical Equipment In The Cab from damage.

2. Component: ‘Vehicle speed signal controller’ (3802060K61B) & ‘Coolant level controller’ (3818080-240)
These (Comp 45, 43) are critical monitoring modules. The ‘Coolant level controller’ (Comp 43) triggers a warning light if the engine coolant is low. The ‘Vehicle speed controller’ (Comp 45) interprets the signal from the transmission (specifically for 11.00-series tires and a 5.769 axle ratio) and sends an accurate speed reading to the ‘Instrument cluster’ (Comp 44). These are vital inputs for the Electrical Equipment In The Cab.

3. Component: ‘Intermittent wiper controller’ (3741060-240) & ‘Flasher relay assy’ (3726030-A01)
These (Comp 33, 23) are dedicated relays that control timed functions. The ‘Flasher’ (Comp 23) creates the “blinking” for the turn signals. The ‘Wiper controller’ (Comp 33) manages the “intermittent” delay settings for the wipers. These simple but essential modules are key parts of the Electrical Equipment In The Cab.

Core 4: The “Switches, Sockets & Lighting” Logic (Ancillary Controls)

This final group includes the various switches, lights, and sockets that complete the Electrical Equipment In The Cab interface.

1. Component: Safety Switches (Brake, Clutch, Door)
This group includes the ‘Brake light switch’ (Comp 7, 3720010-A01), ‘Clutch switch’ (Comp 39, 3754030-A01), and ‘Door warning switch’ (Comp 42, 3818060-A01). These are critical safety inputs for the Electrical Equipment In The Cab, controlling the brake lights, starter interlock, and “door ajar” warnings.

2. Component: Power Window Switches
This group includes the ‘Left power window switch’ (Comp 35, 3746015-A01), ‘Right power window switch’ (Comp 36, 3746020-A01), and their ‘Cover plate’ (Comp 34, 3746011-A01). These components control the driver and passenger windows.

3. Component: Power Sockets & Diagnostics
This group includes the ‘Cigarette lighter’ (Comp 21, 3725020-A01), ’24V power socket’ (Comp 31, 3736050-828), and the ‘OBD diagnostic socket housing’ (Comp 4, 37-1418985-2). The OBD port is the diagnostic interface for the entire Electrical Equipment In The Cab, allowing technicians to read fault codes.

4. Component: Interior/Exterior Lighting
This (Comp 2, 25, 26, 27, 28) includes all other lights, such as the ‘Front decorative lamp’ (Comp 2), ‘Left/Right front clearance lamp’ (Comp 25, 26), and ‘Left/Right door reflectors’ (Comp 27, 28). These are all essential parts of the Electrical Equipment In The Cab.

Electrical Equipment In The Cab: Complete 49-Part Breakdown

The following table provides the complete, detailed breakdown of all 49 component types in the Electrical Equipment In The Cab for the FAW Jiefang CA3250P66K2L1T1E 6×4 dump truck. This list is essential for any service of the Electrical Equipment In The Cab.

Core Specifications

The specifications for the Electrical Equipment In The Cab are defined by its function as the central nervous system for all driver controls, instrumentation, and body electronics. A properly functioning Electrical Equipment In The Cab is critical for vehicle operation.