Hi,
I would like to know if somebody experience this problem and the possible solution.

On my 7 pins connector for trailler, i don't have any volts on the black wire. It suppose to have 12 volts.
All other wire are ok
Is there any fuse ?
Where i can find wire harness routing ?

Thank's

 

It depends is it factory harness or aftermarket. Can you follow the wires back there should be a fuse for it. Also are you checking for power at plug or are u checking the wire behind the plug if you are checking from the plug the metal connectors tend to corrode and not work anymore ive had that happen on 2 different trucks.

 

it's a factory harness.
I check the 40a fuse under the hood and the relay, both are ok.
My electric brake and all lightnening are working.
Where is the fuse you are talking about ?
I will deassemble the connector and check for corrosion
Thank's

 

If you have a manual check to see if the fuse is tied in with anything else but im sure if it is blown then your tail lights/signal wouldnt be working.