SOLVED! I've read many threads just like this and you guys mostly have my exact problem. Here's what the problem was and how I fixed it:

First, in my 2012 Ford F150 the right blinker (flasher)/ brake light would not work. Turn signal blinked fast inside and for the front light and the mirror signal but tail light blinker would not flash. The bulbs were fine, I even replaced with new just to double down. The tail lights would light up when my headlights were on (running lights) but would not get brighter when brake depressed and would not flash for turn signal.
I will tell some of you to keep in mind that yours may light up also so you don't think you have a bulb out but keep in mind there are two sepperate tungstan filaments (squiggly light wires) in each tail light and the brakes and flasher one could be bad and your running tail lights still work so definately change your bulbs FIRST, then do this if that was not it.

So I had the problem for many months and refused to take my truck to the dealer where of course they will want to replace things and rewire and god knows what else and I've read where one guy says Ford charged him like $800 to fix this. I fixed this problem with $9.00. Saw a Youtube video with a guy with the same problem and he bought an ELM Interface scanner, plugged into the vehicle under the steering wheel and scanned his own truck with an Android app. So I bought the same one on Amazon (here is the link)

Note: this one is for Android phones. if you dont have Android just find a OBD 2 scanner that works for your OS

 
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(see update below if this one is sold out)


I found a free app called Car Scanner ELM OBD2 by OvZ it's a generic looking logo of a blue square with a white engine. But I actually saw tons of these apps and I'm sure other apps would work fine as long as they're ELM OBD2 scanning apps with high ratings.

I scanned my truck hoping to see some code come up about the BCM (body control module which is where the problem is) but did not see that code. Didnt matter. I CLEARED what unuseful codes I did see and that immediately fixed the problem and my damn flasher and brake lights are all working again. THANK GOD FOR THIS. Super cheap and easy. I'll never go to a dealership. Hope this helps y'all.

[[UPDATE- 8/28/20
Some people have been commenting me that the link I posted for the Amazon product is no longer in stock. Look, thats the one I used and the only one I can really vouch for but I'm sure the others do the job. Just search OBD2 Scanner and make sure it says it will work for your phone android or IPhone (I think some even work with laptops). they range from $10-$99. Mine was $10 and did the job.

Here's one that works for both phones and is $20

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Heres a similar looking one I just found but its $22 and is Android only.

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End of update]]

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