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1. Yellow cable (BATT/B+)
The yellow cable should be connected to the fuse of the constant power
supply in the car fuse box. If you are looking for a constant power supply
in the fuse box: Use a voltage tester to check the fuse to ensure it still
have electricity even if the car engine is off.
2. Red cable (ACC)
Connect the red cable supply power only when the car engine starts.
Testing method : The tester bulb will light when the engine if on and
won't light when the engine is off.
3. Black cable (GND)
Connect this black cable(GND) to the metal part of the vehicle. Most cars
have screws or metal parts next to the fuse box. Connect the black cable
to the screw or metal part. (As in the picture below)
.
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