Speaker wiring diagrams

Since you pulled the radio out
unplug the radio connector and check for power you should have two cavities at least, have battery power
one all the time and one with key on (I cant recall the color or the numbers and I am away from my books to check )
we just had one yesterday and the radio was no good
3rd in 7 month, is it a common thing maybe not, but it is very possible
good luck