Audio Systems: 1997 Dodge grand caravan, dodge grand caravan, aiwa cdc

Question
i have a aiwa cdc-217 stereo my husband installed, before he installed all speakers worked now only the small ones do we went back to Best Buy(thats where we bought the cables) to see if they could check if there was another cable for it they say no its correct and told him to try another method of wiring he did and its still only half speakers...this really stink when you wanna hear in the back and the widows are down or the kids wanna hear their songs...lol

Answer
try another method of wiring ??  there is only one way to wire the speakers the right way
the problem is that the infinity amplifier is off and needs to be turn on
use the blue wire from the new radio and look in the other side of the harness you are missing
one wire  

good luck