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Terminals 4A and 12A are both battery positive. Wire color is green with a brown stripe.
This wire is "live" at all times, even with the ignition key off and removed.
If you prefer a +12V source that is only active with the key on, use terminal A13; wire color, depending on your radio, is yellow with a violet stripe or yellow with a black stripe.
If in the US, you can but plastic "taps" at Home Depot or the Radio Shack that only require pliers to make the connection. No wires need to be cut. Internal blades pierce the insulation to make the connection.
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