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So I've done a lot of research online before the swap - I have a 2008 Tahoe LTZ that had factory navigation, and I installed a HDD nav radio from a 2012 Yukon in it using the adapter harness. The radio is properly configured to the truck, everything works great. Except...
For some reason, the radio will NOT turn on unless the engine is actually running. If you turn the key to accessory, nothing. Run.. nothing. Start the engine? Radio comes on. Turn the engine back off one key position? Radio is back off.