What I did with mine, pull out the radio. Behind there, I had two plugs unconnected, taped togeather and to another set of wires. Turn your key to accessory, the first position. One of the wires (mine was blue) leading to the 'empty' plug should give you 12v when in acc. Just tap into that. I have no idea what the plug is supposed to be for, but it works great.
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