lProbe CD player problem

My friends aftermarket CD player wont work becuase he cant get the speaker wires hooked up to the cd player..it worked for like 2 minutes then stopped..

If he can't hook up the wires then how did it work at all? The stereo didnt come with any harnesses or anything?

even if the stereo came with a harness it wouldnt just hook up.especially if it has a factory amp