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18
2.3.6.2 Obtaining Connection Modes of the Main Power Switch
In order to ensure correct cable connection, it is necessary to obtain the connection mode of the
main power switch through three methods (is the main power switch connected to the positive or
negative pole of the battery?).
Ask the vehicle manufacture the connection modes of the main power switch of the vehicle.
Measure with a multimeter: disconnect the main switch, then measure the voltage between the
vehicle body and the positive pole of the vehicle battery. If the voltage is 12V or 24V, it means
that the main switch disconnects the positive pole. If the voltage is 0V, then the main switch
disconnects the negative pole.
Visual inspection: whether the switch cable near the vehicle battery is connected to the positive
pole or the negative pole.
2.3.6.3 Connecting Operation
The driving recorder must be connected to the ground wire. ACC signal, and constant electricity.
Enable the main power switch on the vehicle, place the key in the OFF state, and then
measure the normal live electricity of the vehicle.
Use a multimeter to measure the voltage on the fuse by switching to the DC voltage range.
When the multimeter detects voltage, it measures the normal live electricity on the vehicle.
Generally, the voltage is 24V DC for large vehicles and 12V DC for small vehicles. However,
this is subject to actual data.
When the vehicle key is placed at the ACC state or the ON state, the ACC signal of the vehicle
is measured.
Use a multimeter to measure the voltage on the fuse by switching to the DC voltage range.
When the multimeter detects voltage, remove the car key. If the voltage changes to 0V, it
means that the measured signal is ACC on the car.
Turn off the main power switch on the vehicle, and place the key in the OFF state.
Connect the power cable according to the main power switch installation mode. See Figure
2-16 and Figure 2-17.
Before connecting with power cord, select proper fuse. 7.5A fuse is recommended.
The positive and negative poles of the battery must be equipped with protective
devices such as fuses.
For vehicles where the master power switch is installed at the cathode of the
accumulator, isolation installation is needed.
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