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Message: <blockquote data-quote="2004tundra" data-source="post: 8741601" data-attributes="member: 682704"><p>Update....this has to be something in the toyota computer. Got a new head unit (sent both of the other ones back) confirmed new head unit is working by connecting directly to a 12v battery. Ran a brand new separate ground to bare metal on the frame. Constant 12v wire now reads 12.65v with truck off and 12.96v with truck running. ACC wire reads 12.96v with truck running. These readings were taken from the harness that plugs into the back of the head unit. As soon as the harness is plugged into the head unit both wires drop to 1.6v. if just one wire is plugged into the head unit, both wires drop to 1.6v. Tomorrow I'm going to run an ACC wire from one of the cigarette lighters and tap a fuse for a constant 12v and see if that will work. Damn you Toyota!</p></blockquote><p></p>

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