I was wondering if anyone else has had water get into the channel where the wires run on the passenger side under the door sill plate. I have an 06 screw and a while back I heard water sloshing when I would brake. Then one day when i was under my truck I pushed the rubber plug in, on the cannel in the back and a good amount of water came out. I talked to my friend who is a Ford tech and he checked and said there was no bulletins about it. Then last week I heard it again, so this time I pushed the front plug in and again some water came out. I had to take the door sill guard up to get the plug out and found it was satill a little wet in there so I dried it out as best as possible and put the plug in from the outside instead of the inside like the factory does to make it easier next time I hear it. The only thing I can figure is maybe one of my moonroof drain lines on that side is not routed right and the water is draining inside that channel. Let me know if anyone else has or heard of this before. Thanks

 

Check the seal for the third brake light, do a search. There are numerous threads about this.

 

I have this problem sometimes.

 

theres 3 possible ways it could get in:

front windshield leak
faulty seal on conduit going through firewall
3rd brake light

It should be fixed under warranty... mine was the conduit and it fried my fuse box...600 dollars to fix but I was out of warranty

 

Yes I had a Hell of a time tracking thre source! I ignorantly disregarded the known issue with the third brake light. The fact that the problem is isolated to the passanger side was very deceiving. I thought the light would allow water to flood the enire rear of the truck. WRONG!! The sheet metal will channel the water directly to the furthest rear corner of the pasanger side and it settles under the door jamb. To confirm I tossed a hose on the roof and watched with the interior panel removed. Bingo! Good luck

2004 fx4 f150 supercab

 

Pay close attention to the 3rd brake light, I had mine at the dealer 2 times for water leak and that's what it was, i finally pulled my light and sealed it myself and has not leaked since.

 

I had the same issue last year but it was the multiple rubber seals around the clips for the plastic door sill cover. The clip holes for this cover are exposed underneath to the ground, allowing splashed water to intrude into the wire trough.

 

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