Viofo HK3-C Hardwire Kit User manual
The user manual is available on
https://support.viofo.com
https://www.viofo.com/en/blog/how-to-hard-
wire-viofo-dash-cam-with-hk3-hardwire-kits-b57.html
Scan the barcode or click the link to
watch the video installation guide.
Copyright 2022 VIOFO Ltd. All Rights Reserved.
USER MANUAL
( Compatible with: VIOFO A139 Dash Camera )
HK3-C Hardwire Kit
C
Power cut-off settings
Please ensure that you have set the parking mode options in
the camera settings before installation. The VIOFO HK3-C
Hardwire kit will power the dash cam in parking mode until
the voltage of your car battery drops to the configured
value or the configured timer expires. (Please set the parking
recording timer using the VIOFO APP.)
Note: Before starting the installation, ｗe suggest that
the Hardwire Kit should be installed by professionals.
The HK3-C Hardwire Kit provides permanent power to the
dashcam for the parking recording function. The ACC
detection function will switch the dash camera into parking
mode automatically when the vehicle engine is shut off and
will resume normal recording when the vehicle engine is
turned back on. The Low Voltage Cut-off function will
protect the car battery from excessive discharge.
Features
HK3-C Hardwire Kit
Battery (+)
(Red)
Ground
(Black)
ACC
(Yellow)
4000mm
3000mm
58mm
USB Type-C
Plug
Battery：Constant power fuse slot
ACC：Switched fuse slot
Ground：Ground point
Adapters Hardwire box Ferrite Ring Core
Specifications
Total Cable Length: 4 Meters
Input Voltage: 12-24V
Output Connector: USB Type-C Plug, DC 5V2A
Input Interface: ACC (Yellow), Ground (Black), Battery (Red)
Battery Protection Options:
Working temperature: -30°C to 60°C (-22°F to 140°F)
Protection: Low Voltage Protection, Over Current / Surge
Protection, Reverse Polarity Protection
11.8V / 12V / 12.2V / 12.4V
23.6V / 24V / 24.4V / 24.8V
ACC
Accepts Voltage from 12 – 24V
4 Options For Voltage Cut-Off to Prevent Battery Drain
ACC Detection, Automatically Switches Parking Mode
Compatible with: VIOFO A139 Dash Camera
Constant Power Supply
Yellow (ACC) accessory power supply — Connect to a fuse
that turns on / off with the engine.
Red (Battery) constant power supply — Connect to a fuse
that is always powered, the connection must be made after
passing through the fuse.
Black (Ground) connection — Place the spade connector
under the head of a ground point screw or bolt ensuring a
clean electrical contact and tighten the screw to secure.
Connect the fuses
5
Make sure the engine is off and accessory power is off before
proceeding.
Fuse boxes and fuse types vary not only between car
models, but also on year and variant. Check the Car Manual
to find the fuse box location and confirm the fuse type.
Locate your Fuse Box
Installation steps
1
To identify a suitable ground point, use circuit tester in
continuity mode. Locate a screw with direct connection to
the vehicle body and check for a good continuity reading
between the screw and the vehicle body, this should be <
0.1 ohm.
Locate a Ground point
3
Use an Add-A-Fuse kit （sold separately） for a clean
installation. Once the fuse slot and type of fuse required for
the hardwire kit is determined, a suitable add-A-Fuse kit can
be crimped to the hardwire kit ACC and BATT connections.
The crimp can be made successfully using either a standard
crimp tool, or using standard needle nose pliers.
Note: Fuse boxes and fuse types vary not only between car
models, but also on year and variant. Check the Car Manual
to find the fuse box location and confirm the fuse type.
Connect an Add-A-Fuse kit to the hardwire kit
4
Battery Wire (RED)
To identify a fuse for the battery connection, turn the ignition
switch to the lock position. Look for a fuse that is live (allows
electricity to flow) even when the ignition switch is in the off
position. You can identify the fuse by applying a
fuse/circuit/voltage test device when the engine is off. Place
the tip of the tester on the exposed metal part of the fuse.
ACC Wire (YELLOW)
To identify a fuse for the ACC connection, turn the ignition
switch to the ACC (Accessory) position. Look for a fuse that
is live when the ignition switch is in the ACC position but off
when the ignition switch is in the off position.
Identify which fuse is ACC & Battery
2
Note: We recommend you test that the hardwire kit and
camera function correctly, before fully securing the cables
neatly behind the vehicle trim, because it is easier to
troubleshoot if the wires are easily accessible.
After connecting the power and ground wire connections
(Red, Yellow and Black), plug the hardwire kit into the
camera, then start the vehicle to check that it works. Also
check the camera parking mode settings in the Viofo app.
Test the Dash Cam 6
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