Alpine CDA 7893 CD Player "kenwood kdc mp333 wirings" Questions

Kenwood KDC-MP333 in-car head unit I've recently bought a car with this Kenwood head unit in it, I'd say by the dodgy in the door it was a very bad home job but it's been working alright but now the ...

...kenwood KDC-MP333 in my truck is connected to a set of kenwood speakers. But when I turn it on they won't work the stereo still shows the display but when I turn the stereo on it makes a sort of ...