ive currently gt a 2006 radio in sierra with two plugs on back..

ive jsut purchased a 2007rds radio with amp and 10 disc changer with control module

my plugs do not fit new radio... one doe swhich turns radio on but den the other doesnt this is the speaker plug... im so stuck and really want this to work....

i have gt the blue changer lead from changer to changer unit..
i have got the flat lead to go from radio to amp and changer unit..
but i havnt got the other one for amp i dunno what to do can you help