in the car..without any in car camera..what are the component that still draw current from the battery even when your engine is off..
thing like:
1. ECU (internal clock and some other features)
2. ICE (internal clock)
3. IU
4. Car alarm system
5. Head lamp when turn on
now when you install the car camera using just the cigarette plug to the car, there will be no current flow the camera once the engine is off
But, when you install it with the power saver or power magic pro with all wires (black, red, yellow) connected, when you off the engine, the power saver/power magic is still drawing current from the battery to supply the power to the camera for parking monitor.
The yellow cable is to connect to the ignition or ACC, meaning to say, when you turn on your key or crank, the camera turn on. The red wire is connect to the wire that still goes live even when engine is off, in this case connect to any of the above which most installer will connect to the IU.
Now, since the Power save have a build in timer and voltage monitor, it too need current to be constantly supply so that it can monitor. So when you unplug the connector from the camera, you just cut off the current supply to the camera from the power saver but the curent from the battery to the power saver is still constantly been feed into till the timer up or voltage drop to the preset value, like 12V, and then the power saver will be off state.
The power magic pro come with the switch is the only way to total cut off the current to the power magic pro while the power saver dose not have this feature and it depend on the timer and voltage sim switch to do the job. So if you have a weak or old battery, it may cause you to unable to start the car.
How I know, cause I have measure the current before and after the Power saver when the power plug to the camera is unplug.