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Message: <blockquote data-quote="keep_hope_alive" data-source="post: 8218511" data-attributes="member: 576029">you are feeding the factory amp from the aftermarket head unit.   the factory amp should turn on/off with the head unit - that means using the head unit's remote turn-on wire to feed the factory amp turn-on (making sure it's not the power source for the factory amp which would require a relay).for signal, if the factory amp can use the speaker outputs from the new deck as the input, that may be a better choice than unbalanced RCA.  using RCA, you need to make sure the shields (signal ground) are properly handled in the factory amp.</blockquote>

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