B+ or Battery +, also known as permanent live, battery backup or memory live, often a yellow cable is used. These wires are all there to achieve one thing. That is to supply a permanent 12v live feed to a device in the car. The B+ should continue to be live even if the key is removed from the ignition and the car locked and alarm set.
Particularly useful for a universal fit android headunit with is ISO connectors this is quite straight forward to power up. For the custom fit android headunits some information will be needed to discover which pins need the power to get it to boot.
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