2009 Ford F-150 XLT

I’m having a intermittent electrical issue and it’s effecting a number of circuits and I can’t seem to solve this

The affected circuits are HVAC, TURN SIGNAL, FDIM and the 4x4 MODE SELECTOR doesn’t work at all like no power to the circuits at all. Press the power on button on the hvac nothing happens same thing with the turn signal nothing happens

My FDIM displays “built ford tuff” always but the temperature in the upper right hand corner doesn’t display and in this instance when it doesn’t display that’s when you notice the electrical issue nothing mentioned above will work

Things I thought would be the cause is bad ground connections, faulty components, or shorts in wiring

The rocker panels are fairly rusted where the ground strap is located but I’ve tested the grounds (the actual ground strap and shared ground points behind the dash) with a self made test light having one wire on positive and completing the circuit by touching the ground points the test light turned on so I rules out bad ground.

no fuses are blown

I’ve attached to videos for a visual in the first video everything is working. In the second video you can witness the issue going in and out

Any help or suggestions would be greatly appreciated


Here is the link for the first video when everything is working correctly
https://youtube.com/shorts/hXrcnKIAW44?si=khoUgtKbpzAKNAZb


This is the link when the intermittent issue is present
https://youtube.com/shorts/mYPY_c4_9EY?si=m8cgQEXb4c8E8yBk

 

You have to post videos somewhere else like YT, then link to them here. Videos don't actually attach here.

 

Ok thanks for that info…..I’ve posted the videos with links in initial post

 

Im not a vehicle techy but familair with electrical wiring ( retired electrician) , from your explanation it sounds like a ground problem somewhere, have you looked at any wiring diagrams to see if those particular circuits share a common ground connection ?
There's a utube video where a guy talks about a useful PDF wring diagram , free download, that may be of some help ?
Link here:

 

I’ll check it out thanks for the help