TERUNSOUL Dash Cam Hardwire Kit for Parking Monitor (23 ft)-Applicable to D021

TERUNSOUL Dash Cam Parking Monitoring Step-Down Cable (23 feet)

D021 Dedicated Fuse Box Power Supply Rigid Cable Kit | 23-Foot Extra-Long Cable | Intelligent Low-Voltage Protection | 24-Hour Parking Monitoring

✅ Designed specifically for the TERUNSOUL D021, it connects directly to the vehicle's fuse box for power, providing continuous power even when the engine is off, enabling parking monitoring.

Product Introduction
The TERUNSOUL Dash Cam Parking Monitoring Step-Down Cable (23 feet) is a dedicated parking monitoring power accessory for the D021 dash cam. It connects directly to the vehicle's fuse box for power, eliminating the need for the cigarette lighter socket, providing continuous power to the D021 even when the engine is off, enabling collision detection and time-lapse recording functions for 24-hour parking protection.

The extra-long 23-foot cable is sufficient to cover various wiring paths from the fuse box to the windshield dash cam location, easily accommodating even large SUVs, pickup trucks, and MPVs. The built-in intelligent low-voltage protection chip monitors the battery voltage in real time and automatically cuts off power when the voltage drops below a safe threshold, preventing battery depletion and ensuring the vehicle can start normally at any time.

Why does the D021 need this step-down cable?

The D021 itself supports parking monitoring, but it must be used with an ACC three-core step-down cable or an OBD step-down cable (sold separately) to achieve continuous power supply after the engine is turned off. If a regular car charger cable is used, the dashcam immediately cuts off power after the vehicle is turned off, and scratches, collisions, or hit-and-run accidents during parking will not be recorded.

Advantages of choosing the fuse box hard-wired version:

Completely concealed wiring – Does not occupy the cigarette lighter socket, keeping the vehicle interior clean and free of exposed wires.

Free up the 12V interface – The cigarette lighter socket can be used for other devices.

Stable and reliable power supply – Directly draws power from the fuse box, more stable than OBD power supply for some models.

23-foot extra-long cable – Easily handles large vehicles and complex wiring paths.

Intelligent low-voltage power cut-off – Protects the battery without affecting vehicle starting.

Key Features
Specifically adapted for D021 – Output voltage and current match the D021 parking monitoring requirements, ensuring stability and reliability.

Fuse box power supply – Connects to the ACC power and constant power fuse and grounds, eliminating the need for a cigarette lighter.

23-foot extra-long cable – Compatible with various vehicle types including sedans, SUVs, pickup trucks, and MPVs.

Intelligent low-voltage protection – Real-time monitoring of battery voltage; automatically cuts off power when it falls below a safe threshold (approximately 12V for 12V systems). 11.8V–12V, 24V system approx. 23.6V–24.2V)

Stable output 5V/3A – meets the power supply requirements of D021 parking monitoring system

Three-wire design – red ACC wire, yellow constant wire, black ground wire, clearly marked, safe wiring

Complete installation accessories – includes power tap, fuse removal tool, voltage meter, pry bar, cable clips, etc.

Safe materials – pure copper core, flame-retardant outer sheath, built-in fuse, overcurrent and short-circuit protection

Installation Instructions

Locate the vehicle fuse box – Consult the owner's manual. The fuse box is usually located under the dashboard or in the engine compartment.

Identify the fuse slots – Use the included voltage meter to locate the ACC (adjustable current) and constant current (current current after engine shutdown) slots.

Install the power take-off – Insert the original vehicle fuse into the corresponding slot of the power take-off, inserting it into the fuse box in the correct orientation.

Connect the cables – Connect the red wire to the ACC power take-off, the yellow wire to the constant current power take-off, and secure the black wire to the vehicle's metal grounding point.

Conceal the wiring – Hide the 23-foot cable along the headliner, A-pillars, and door frame weatherstripping to the D021 location.

Connect the D021 – Plug the output terminal into the D021 power interface.

Test – Start the vehicle to confirm that the D021 powers on normally; after turning off the engine, confirm that the D021 automatically enters parking monitoring mode (parking monitoring needs to be enabled in the dashcam settings).

💡 Tip: If you are unfamiliar with automotive electrical systems, it is recommended to have the installation done at a professional auto detailing or repair shop. The package includes a power tap, fuse removal tool, and voltage meter; experienced users can complete the installation themselves.

Compatibility

✅ Compatible Dashcam: TERUNSOUL D021

✅ Applicable Vehicles: 12V/24V vehicles equipped with standard blade fuses (most sedans, SUVs, pickups, MPVs, and trucks)

❌ Incompatible: Other dashcam models, or vehicles without a traditional fuse box (please confirm before purchasing)

⚠️ This product is a dedicated accessory for the D021. For other TERUNSOUL models, please select the corresponding version.

Frequently Asked Questions (FAQ)

Q: Can this step-down cable only be used with the D021?

A: This product is adapted for the D021 power supply interface and parking monitoring logic. For other TERUNSOUL models, please select the corresponding dedicated version to ensure compatibility.

Q: Will parking monitoring drain the battery?

A: No. It has a built-in intelligent low-voltage protection chip that automatically cuts off power when the battery voltage drops below a safe threshold, preserving sufficient power for vehicle starting.

Q: What's the difference between the fuse box version and the OBD version?

A: The fuse box version has completely hidden wiring, doesn't occupy the OBD interface, and provides stable power; the OBD version is plug-and-play, simpler to install, but occupies the OBD interface. Both can achieve parking monitoring; choose according to your installation preference.

Q: Is installation complicated? Are professional tools required?

A: It requires connecting to the fuse box, so there's a certain learning curve. The package includes a power tap, fuse removal tool, voltage meter, and pry bar. If you are unfamiliar with automotive circuits, it is recommended to have a professional install it.

Q: Will D021 continue recording after the engine is turned off?

A: It depends on the parking monitoring settings of D021. After connecting this step-down cable, the D021 can enable collision detection or time-lapse recording modes, operating according to the set logic instead of recording at full frame rate throughout, to save storage and battery power.

Q: Is 23 feet of cable too long?

A: The extra-long design is for larger vehicles and complex wiring paths. Excess cable can be secured inside the trim panel using the included cable clips without affecting use.

Q: What if the vehicle doesn't have an ACC fuse?

A: Most vehicles have an ACC fuse, but some newer models have different power management methods. It is recommended to consult your vehicle's fuse diagram or have a professional confirm.

Q: Should I unplug it for long-term parking?

A: For long-term parking (more than a week), it is recommended to disconnect the power supply or remove the fuse to avoid the accumulation of small power consumption.

About TERUNSOUL

TERUNSOUL specializes in dashcams and automotive accessories, providing complete power solutions from the main unit to parking monitoring for models such as the D021. This 23-foot fuse box step-down cable has undergone rigorous testing, balancing ease of installation, cable routing flexibility, and electrical safety.

TERUNSOUL Parking Monitoring Step-Down Cable (23 feet) — Keeps your D021 running even when the engine is off.

© 2026 TERUNSOUL. Product specifications are subject to change. Only compatible with D021 and corresponding fuse box interfaces. Please confirm your vehicle model and dashcam model before purchasing.