hey. i got a HU installed in my 92 toyota celica last night. thing is, it works fine sept the left rear speaker isnt working for some stupid reason. so i hooked it up to a 6v battery to see if its workin. it is, seen that when i did so the speakers cap pushed out. when i hook it back up the thewires they just give off a small spark while the cap of the speaker pushes out but there is never any sound.
hook it up to one of the ones that does work for the other speaker. if it plays fine then its the HU or the wiring. If not, its the speaker itself so get it fixed or most likely throw it away