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Message: <blockquote data-quote="starkfu" data-source="post: 3252704" data-attributes="member: 579412">yep, you are losing 12V constant.After reading your last post, I would check your fuses, the circuit that the cig lighter is on runs off the radio fuse too.  In GM, the 12V switched is yellow, the 12V constant is Orange.  So depending on the radio (consult your manual) - the yellow battery wire from your radio should be going to an orange wire in the vehicle's radio harness (test with a multimeter first!!!).  I am guessing that if the old radio was stolen and wires were cut, then the fuse is bad.  The red wire of your aftermarket unit should go to the yellow of the in car harness.The wire colors I gave you are behind the factory plug.  Please test them first to verify function.</blockquote>

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