7 way trailer harness

[Unreal Summit]

A few months ago I hooked up to a trailer and smoked a few wires and the brakes dont work anymore on it. I been trying to figure out what was wrong with my truck. However using a test like everything is hooked up as it should be.  Anyone have any suggestions?? 

[IBMobile]

Did you smoke the wires on the trailer or the truck?

Is it the trailer brakes or the truck brakes that don't work anymore?

What happens when " However using a test like everything is hooked up as it should be"?

[015point9]

You state "a trailer".   Maybe not your trailer if so are both trailers wired the same?  As in both plugs wired the same?

Edited June 5, 2018 by 015point9

[Unreal Summit]

Sorry I should of been a bit more descriptive and clear.  It smoked the ground wire on the trailer and the trailer brakes no longer work. Also when this happens my third brake light lit up and stayed on until I unplugged the trailer.  When I test the plug on the truck using a test light all poles light up when they are supposed to. Constant hot, turn signals, so on. I use a smaller trailer that uses the 4 way plug that works just fine. 

Edited June 5, 2018 by Unreal Summit

[IBMobile]

Sounds like the ground wire became a fusible link and that it was connected to the constant hot which is protected by a 40 amp fuse.   The ground wire might have been smaller than 10 gauge and burned before the fuse could go.  It must have melted into the other wires powering them, like brake light and taking out the circuit for the electromagnets on the trailer brakes.  I'd be checking on how that trailer was wired.  

 

This may help.

 

 

 

 

[Unreal Summit]

That's what I was thinking. It should be a trailer wiring issue not my truck. It should be a ground wire in the incorrect position. Right? 

[IBMobile]

Right, check not only the ground wire but all the wires for correct connector placement, continuity and short circuits.    

[Unreal Summit]

Thank you for your help I appreciate it.

 

[Unreal Summit]

Turned out to be the trailer go figure! 

[Dieselfuture]

I figured that's what it was