It does really matter. Find the Pos side of the batt. and the neg. side of the batt. (Remember "AA") Place the red wire to the Pos side of the batt. and the black wire to the Neg. side of the batt. If the sub moves then it should be ok. Also, with the wires connected as stated above, if the sub moves out then the polarity is correct. If the sub ***** in the wires are crossed.