Like the title says, one of my speakers isnt working. Its a sony explode head unit that i used to have on my prelude. I wrecked it and i had it installed in a ford f150. It was working finr until they installed it and then the right side speaker just whent out. Could it be the head unit? Could it be the speaker? How can i test if ti is the head unit? I was gonna take it back to them but ive been really busy to go and they take forever to look at it. Any help is much appreciated, and thanks in advance, ed.

 

Quick way to test if the speaker or (head + wiring) is to just swap the speakers; if it follows the speaker to the left side & right now works, then the speaker is obviously the problem.
If it remains on the right side, could be the head or the wiring between head & speaker. If you can swap the wires at the head end, that will tell you if its the head or the wiring (if the right speaker still is out, then its the wiring from the head to the speaker that's the problem - if the left speaker is now out, then the head is bad).