Trailer not registered as connected
Have a 2015 F350 towing a fifth wheel When I used to connect cord to the truck the dash would display "trailer connected" and engage brakes Now that alert is not displayed and brakes do not enga...
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LIKE2BUILD wrote:Teamfour wrote:
I just went through this with my F250. Turned out it was a bare brake wire INSIDE the trailer axle. I pulled the wires out and ran new ones in tygon tubing on the outside of the axles. No more issues.
This is a very common problem. Your trailer brake wires are most likely daisy chained so if one has a problem it can take out all 4 brakes. Definitely check for wiring issues, especially a short to ground on the +12V wire.
On an outside chance, are you turning off the truck when you connect the trailer 7-way plug? I'm not sure about Ford, but on some trucks you have to do this or the trailer won't register properly. My friend's 2010 GMC 3500 does goofy stuff if you connect the trailer with the truck running. I've also had odd behavior in my RAM if I connect while the engine is running.
KJ
A short to ground on the +12 volt would or should blow a fuse.
