The blue brake wire should not always be hot; what that means is you likely have a short somewhere that you will need to find. To do this and look for wires that may be pinched or otherwise damaged and fix as necessary or replace it with 10 gauge wire # 10-1-1.
I have also added links to help articles on brake controllers and troubleshooting brake controllers which I highly recommend checking out. I have also added a help article on trailer wiring which you may find useful. view full answer...
If you are getting low voltage at the running light pin on your 2015 Ford F-350 then you will want to start off by checking the grounds on your F-350. Make sure they are secure and connected to a clean, bare-metal surface.
If that is the case then you will need to move on to the wiring itself. Check the wiring on your running light circuit for any places where it is damaged, bent, exposed, or corroded and replace. You can use 16 Gauge Wire # 16-1-1 and Butt Connectors # DW05744-5 to do... view full answer...
All you should need to install an aftermarket brake controller like the P3 # 90195 that you referenced in a 2015 Ford F-350 Cab and Chassis is the correct install harness part # 3034-P. There would be no need for you to have the computer of the truck messed with at all.
Since the truck is brand new the trailer is most likely where the problem lies unless you know that it works with a different truck.
You will want to first check the trailer connector for corrosion and clean as necessary... view full answer...
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