no power to amp?

When i first got my mp3, i put in 2 12's that i had from my old car. Well today i wanted to get more power and add the original stock kenwood sub as well. Well i couldn't figure out how to do that, and now my amp doesnt even receive power to kick back my 2 12s? anyone know what the problem could be? From the original wiring..the yellow one is battery correct?
 
check the fuse. If you are running two 12's wuth the stock wireing you are asking for a fire. the sub we have is only like 80 watts to run two 12's you are running somthing like a 100 watts a peice right? if so Bad news.
 
What is you other amp and how have you wired in the other subs and the kenwood? what guage power wire is running to the amp and to the Kenwood powered sub?
 
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