Audio Systems: wiring aftermarket speakers, dodge magnum, factory speakers

Question
i have a 2005 dodge magnum and just replaced the head unit. i want to replace
the factory speakers but dont know which wires are positive and which are
ground.

Answer
Simple.

Take a AA battery and some space section of wire. Connect the battery (momentarily) to each speaker looking at each speaker. If the speaker pushes out, note the polarity of how you have it connected. This will be it's polarity. If the speaker sucks in, the polarity is reveresed.