From what I can gather, there's supposed to be a red wire, a black wire, and a brown wire to connect to the iso plug (+ the arial and speaker wires). However, I have only got red and black (no brown) and they both seem to be direct live wires (not switched on or off by the ignition).
If I take an earth wire to a point on the bodywork then will that do?
Will it cause problems if I connect a constant 12v wire to the switched 12v terminal or should I not connect a wire at all? :?: