Okay... I just bought some new speakers for my 04 Focus Zetec. I'm all ready to install them but I've fallen at the first hurdle. The wires that were connected to the Ford factory speakers are white and grey. Which is positive and which is negative? Or even more helpful to an amateur like myself: which connects to the thicker of the two din plugs (positive?) and which the thinner (negative?).
And yes... I know I could have bought some Focus speaker wire adapters but I thought a crimper and some butt connectors would be just as easy and I've already started cutting wires!