My car stereo speakers are static-y and cutting out at times. What could be the problem?

Question

Bought used 02 ford focuszx3 hatchback w 6-cd player (think its stock?). Prev. owner had other speakers installed (found paperwork under floormat),and cars' rear spkrs didnt work so I assumed stock rear speakers were disconnected. I tore car apart and re-connected speakers, now none of the speakers works right; one front spkr sounds blown (didn't sound this way when it was only front ones working), they cut in/out, have static, and the fade and balance won't work right digital display on head unit won't move through numbers sequentially when trying to change fade/balance ie: as you turn k**b to fade spkrs to front, it might do this: F1, F2, F7,F1,F2,F1,F2). What could be the problem? short in wiring? could I have something hooked up wrong (the adapters on end of wires will only fit speaker one way so I cant have neg/pos backwards I dont think unles prev. owner had changed wire ends)? I know nothing about speakers/stereos all advice helpful. Looked on Crutchfield, info too general

Answer 1

Sounds like not only are some speakers connected wrong, but also the radio itself may have issues due to you claiming the fade option skips.

Answer 2

It probably has a wire loose to one of the speakers.  check them all and tighten up.  If it is soldered, you would need to find someone who knows how to use a soldering iron.  But usually they are just twisted on.  I agree with first writer, they are probably connected to wrong places to start with.