The ACC (red) 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 wont light when the engine is off.
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The B+ (yellow) 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.
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The Ground (black) This black cable is connected to the metal parts of the vehicle. There are screw nails and metal parts near the fuse boxes in many cars. Connect the black cable to the screw or metal part.
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