Alright i have one here to stump everyone.... My uncle called me and his 05 f150 STX left speakers both front and back arent working. I took a look at it the other day, i switched his radio with my radio from my 06 f150 stx, then i switched my front speaker out. didnt work. I looked at his back speaker and the magnet on the speaker was stuck in the door. I checked fuses and dont see any blown. Any other ideas?

 

could be a break or short in the bundle of 4 speaker wires probably between the drivers side door and the radio. Is this on an extended cab or regular cab? I would try to follow the wires back from the speakers to the radio. Possibly leave the radio on so when you get to the break in the wires you'll know where it needs to be fixed. I know you run the risk of blowing the fuse if it shorts out but I guess that's were I would start. I'm sure someone else here has run into something similar and can help you out more. Good luck!

Here are the color coding for the wires from the left speakers to the radio:

left rear + Grey/Light Blue
left rear - Tan/Yellow
left front + Orange/Light Green
left front - Light Blue/White


There is a junction point (C238) before the wires enter the doors down behind the hood release area:


Other than the connections at the speakers and at the back of the radio, C238 is the only other place where all the speaker wires would connect.

 

I am having the same issue of both left side driver and passenger side speakers not working. Reseated the large driver door jam connector with no change. Saw this post regarding a junction named C238 but i cant seem to locate it.
Any further help or detail on this would be helpful as this seems like the most likely place for this symptom to exhibit itself.
thanks.

 

Have you checked the following fuses for the base radio in the central junction box? Fuse 1-10amp; Fuse 7-5amp; Fuse 22-10amp; and Fuse 31-20amp.

 

Has anyone found the problem
or have an update?

I have a 2010 350. Premium sound with sat nav. Right side and sub work well. Nothing at all on the left. Haven’t yet been able to track the issue.