Hi, So recently I got a really nice touch screen radio for my 79 Camaro Z28. After looking in the instruction manual it says it needs three wires to hook up to. 1.A constant power (found) 2.A ground (found) 3.A power that is only on at ACC (trouble finding). The original plug for the original radio is no were to be found so I need to splice into some wires. But I can't seem to find any wires that are only powered on ACC that could be easily spliced into. Would anyone know a wire that could easily be spliced into that's only powered in ACC?