I have a 99 F250 Superduty and only one speaker is working, the back speakers have a little sound but can barely notice and the driver speaker no sound comes out at all, so mainly the only speaker you can hear is the passenger side. I was wondering what can i do to solve this problem and where to start looking or if anyone knows how to fix it, then share their knowledge!

Thanks

 

You probably have already done this, but make sure the balance and the fader controls are in the correct position. Then;

Take the door apart. Take the speaker out. If you have a ohmmeter you can read across it and see if it's good. If you do not have a ohmmeter, you can take a small 1.5v battery and touch the battery to the speaker. You should see and hear the cone move as you touch the battery to the terminals.

If that's good, I would check the wiring. I would plug it back in and see if it starts working again, sometimes it's just a corroded connection. If it still doesn't work, play the radio while you wiggle and mess around with the wiring in the door jamb. The driver's door gets opened and closed the most, and the wires are known to break from getting flexed all the time.