does anybody know what the positve and negatives are for all the speaker wires installed on factory 2000 volvo s40's?? every speaker has different colors and on some wires both have the black stripe. i just got new speakers and really want to get them in right and sounding good......any help is really appreciated....

 

The factory speakers are marked.Follow it and color the wires up for yourself.
Only have the 2003-2004 wiring but it can't be much different from yours.