Ford Focus speaker wire colour code

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!
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White is often a ground, but sometimes the terminals are marked + or- Or, just connect them either way ; the right way will be clear, the wrong way will be muffled or noisey. Oh, and one mistake I learned; unless you are running a power amp, don't install speakers rated at a higher wattage than your stereo; when you crank up the volume, the stereo will not be able to put out enough power to drive the speakers, and the sound will break up. I always thought it would be the other way around, but actually, speakers rated just less than the stereo output works best..

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snipped-for-privacy@gmail.com wrote:

matter) to the speaker. if the cone moves out, the positive of the battery is connected to the positive of the speaker. If the cone moves in, the positive of the battery is connected to the neg of the speaker. You should be able to figure it out from here :)hopefully you know which wire went to which side of the speaker before you cut them :(
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