Theocoog

I believe it's the one that runs from inside the door to under the dash below the A pillar, so it must have the speaker, the door lock, and the window motor. I will report back when the work is done.

NewBlue2010

I replaced the speaker adapter harness from the stock harness to the aftermarket speaker terminals. That did the trick. I guess all the moisture in the door was the culprit.

DCELL

I wonder how that moisture is getting in there. I've had the speaker problem in the drivers door. I had the door panels off today for another reason and decided to look at the speaker connections while I had them off. there was moisture in the connecter, the metal tabs inside it were discolored from the moisture. I blew it out with air can, cleaned the terminals/tabs, taped it up, put it back together. I have an extra speaker adapter harness somewhere, when I find it, I guess I'll replace it if what I already did doesn't help.

Theocoog

It's fixed! They replaced the wiring harness and all seems good:

https://www.f150forum.com/f38/left-f...2/#post1815675

NewBlue2010

I think it is from the AC being blown through the side of the dash into the vents on the door panel. It probably sweats when humid/warm outside. Also typical stuff like rolling down the windows with dew on them are probably to blame. I stocked up on harnesses from Crutchfield and will change them out every 6 months or so. I live at the beach in NC so salt air corrosion is nothing out of the ordinary.

DCELL

That does make sense... The moisture I saw was not enough to really be "leaking" into the door from somewhere. Anyway, thanks. I'm going to replace that connector, put some grease on it and get some extra connector adapters. Great idea.

daystrom

I still don't see how those two-wire connectors that connect the main harness to the speaker can get any moisture in them. There is a rubber gasket around the thing.

Why don't any of the other connectors in the door have problems like the locks or windows which have no seal at all?

The problem has to be in the main wire harness from the door jamb to the speaker.

NewBlue2010

You're welcome bud! Glad I could help.

From personal experience that was the issue and solution that worked for my truck. I'm sure theres a different location for the issues occurring in other members' trucks.

ctcam82

My 2011 crew is doing the same thing in the front passenger door. I guess I'll take it in to the dealer sometime and see if they take care of me.

seadragon

Just wondering, is there any kind of vapor barrier in the door? It used to be that when you took the inner panel of a door off, you were greeted by a plastic/paper type vapor membrane. If no vapor barrier, I could see a lot of condensation happening inside the door when the temps are significantly different inside/outside.