Best Dash Cam Hardwire Kit for Parking Mode
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In this guide (8 sections)
Top picks at a glance
Best for VIOFOVIOFO HK4 Hardwire KitView on Amazon
Best for BlackVueBlackVue Hardwiring KitView on Amazon
Best for ThinkwareThinkware Hardwiring CableView on Amazon
Best for GarminGarmin Constant Power CableView on Amazon
Best USB-C universalVantrue Hardwire KitView on Amazon
Parking mode is one of the most useful dash cam features: the camera keeps watching while your car is parked and records bumps, break-ins and hit-and-runs. But it needs power when the ignition is off, and a 12V socket plug usually turns off with the car. A hardwire kit connects the camera to your fuse box, switches it between driving and parking modes automatically, and cuts power before your car battery runs too low to start.
Quick answer: buy the hardwire kit made for your camera brand. For VIOFO cameras that is the VIOFO HK4, which switches to parking mode automatically and has four low-voltage cut-off settings; for other USB-C dash cams, the Vantrue hardwire kit is the most universal choice.
This guide covers five hardwire kits, explains how they work and walks through a clean, safe installation.
How we picked
The most important rule is compatibility: a hardwire kit should match your camera's connector and parking-mode design. So we picked the official or best-matched kit for five popular dash cam brands, then compared low-voltage cutoff settings, connector type and included fuse taps. Brands cannot pay for placement.
Quick picks
| Hardwire kit | Works with | Best for | Price |
|---|---|---|---|
| VIOFO HK4 Hardwire Kit | VIOFO cameras | Best for VIOFO | Check price |
| BlackVue Hardwiring Kit | BlackVue cameras | Best for BlackVue | Check price |
| Thinkware Hardwiring Cable | Thinkware cameras | Best for Thinkware | Check price |
| Garmin Constant Power Cable | Garmin dash cams | Best for Garmin | Check price |
| Vantrue Hardwire Kit | Vantrue and USB-C cameras | Best USB-C universal | Check price |
How a hardwire kit works
Most kits have three wires:
- Constant (BATT+): power that stays on when the car is off. This keeps the camera running in parking mode.
- Accessory (ACC): power that only comes on with the ignition. The kit uses it to tell the camera whether you are driving or parked.
- Ground (GND): connects to bare metal on the car's body.
A low-voltage cutoff turns the camera off when the battery drops to a set voltage, so you can still start the car. Choose a higher cutoff in cold climates or if your battery is old.
The best dash cam hardwire kits
VIOFO HK4 Hardwire Kit
Best for: VIOFO owners who want ACC and parking mode.
The VIOFO HK4 is a USB-C hardwire cable for VIOFO dash cams such as the A329, A229, A119 Mini 2 and A139 Pro. It uses ACC detection to switch the camera into parking mode when the engine turns off, and lets you pick one of four low-voltage cut-off points to protect the battery. Fuse taps are not included with this version.
Pros
- Made for VIOFO cameras
- Automatic switch to parking mode
- Four voltage cut-off settings
- USB-C connector
Cons
- Fuse taps sold separately
- Only for VIOFO models
BlackVue Hardwiring Kit
Best for: BlackVue owners.
This BlackVue kit is a 4.5 m (14.8 ft) hardwiring cable for connecting a BlackVue dash cam to the fuse box for parking mode. It includes Micro2, Micro3, Mini, LPM and ATO fuse types with fuses already fitted, and works with both 12V and 24V vehicles by passing the same voltage through to the camera.
Pros
- Long 4.5 m cable
- Five fuse types included
- Works with 12V and 24V vehicles
- Made for BlackVue cameras
Cons
- Check compatibility with your BlackVue model
- No adjustable timer or display on the cable
Thinkware Hardwiring Cable
Best for: Thinkware owners.
The Thinkware hardwiring cable connects a Thinkware dash cam to the fuse panel. It enables parking mode with impact and motion detection, and activates the camera's built-in voltage meter so it shuts off if the battery runs low. The cable is 9.8 feet (2.98 m) long, and Thinkware recommends professional installation.
Pros
- Official Thinkware cable
- Enables parking mode
- Uses the camera's low-voltage cut-off
- 9.8-foot length
Cons
- Only for Thinkware cameras
- Fuse taps may be needed
Garmin Constant Power Cable
Best for: Garmin dash cam owners.
- Connector Type
- OBD-II
- Other Special Features of the Product
- Tangle Free
- Maximum Voltage
- 12 volts DC
- Indoor Outdoor Usage
- Outdoor
- Item Length
- 1 inches
- Item Shape
- Round
The Garmin Constant Power Cable plugs into the vehicle's OBD-II port to keep a Garmin dash cam powered when the car is parked and turned off. There is no fuse box wiring. Amazon lists compatibility with Garmin models such as the Dash Cam 47, 57, 67W, Mini 2 and Tandem.
Pros
- Plugs into the OBD-II port, no fuse tapping
- Powers parking features on Garmin cams
- Tangle-free cable
Cons
- Only for Garmin dash cams
- OBD-II plug can get in the way of your knees in some cars
Vantrue Hardwire Kit
Best for: Vantrue and other USB-C dash cams.
This Vantrue kit is a USB-C hardwire cable with a small display and three low-voltage cut-off settings (11.6/23.6V, 12/24V and 12.4/24.4V). It accepts 12V and 24V vehicles and outputs 5V for USB-C dash cams. Vantrue lists its own N5S, N4 Pro, E1 Lite and other models as compatible.
Pros
- Works with many USB-C dash cams
- Three voltage cut-off settings
- Display shows battery voltage
- 12V and 24V vehicles
Cons
- Not for cameras with barrel or mini-USB plugs
- Needs fuse tapping
How to install a hardwire kit
- Find your fuse box (often under the dash or in the driver's footwell) and its diagram in the owner's manual.
- Use fuse taps ("add-a-circuit") instead of wrapping wires around fuses.
- Find a constant fuse and an ACC fuse with a test light or multimeter: one live with the car off, one live only with the ignition on.
- Avoid safety-critical circuits such as airbags, ABS and engine management.
- Ground to bare metal, on a bolt that touches the chassis.
- Route the camera cable along the headliner and A-pillar, clear of curtain airbags.
- Set the cutoff voltage and test: turn the car off and check that the camera enters parking mode.
If you are not comfortable working around your fuse box, have a professional install the kit. Never tap airbag or other safety system circuits.
Hardwire kit FAQ
Will a hardwire kit drain my car battery?
A good kit includes a low-voltage cutoff that switches the camera off before the battery gets too low to start the car. Set a higher cutoff in winter or if your battery is old.
Can I use any hardwire kit with my dash cam?
Not always. Connectors and parking-mode signals differ between brands. The safest choice is the maker's own kit or one listed as compatible with your model.
Do I need a hardwire kit for parking mode?
Most dash cams need constant power for parking mode, which usually means a hardwire kit or a dedicated dash cam battery pack.
How long will parking mode run?
It depends on your battery, the camera's power draw, the parking mode type and the cutoff voltage. Many owners get several hours to a day or more.
Bottom line
Buy the hardwire kit made for your camera. For VIOFO cameras, that is the VIOFO HK4; for BlackVue, the BlackVue Hardwiring Kit. If you are still choosing a camera, see our parking mode dash cam guide.
Sources
Official sources for the standards, safety rules and products in this guide. Specifications change between model years, so confirm current specs and fitment on the manufacturer's site before you buy.
- VIOFO — official site — current product specifications
- Battery Council International — BCI
