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Originally Posted by FW28z
Typically stereos have two 12V inputs. One which is on all the time (which in the case of the Jensen would be B7) and the other connected to the ignition switch (B4 for the Jensen).
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Correct: The "keep alive" 12V lets the clock stay on time in-between "key cycles" (at least for a typical auto installation, and for the Axis installation as long as the chassis battery lasts! LOL).
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