im selling my cobalt it is an 05 base model. i installed aftermarket rear speakers but now im putting the stock rear speakers back in. only problem...i cut the black plugs that connect the wires to the speakers off on both sides. so now i have two stripped wires on both sides. which are the negatives? how should i reconnect them without the black plugs? the left side has a brown and a yellow wire. the right side has a light blue and dark blue. i am an idiot for throwing those plugs away i know.