well i've replaced the speakers in my 96 a couple of times, bad habit, but one hell of a sound system. i don't have the infinity system stock, but i've found that the lighter shaded wire is usually the negative or ground. if you have a ZJ it is probably the same except for the tweeters in the triangles and the 4 inch rounds in the dash. not real sure how those would be wired up, but i'd be guessing that they would be the same.