trailer light problem from the truck side

good afternoon, I have a problem with the wiring on the truck side. I only have tail lights on the trailer no brake or turn signals. I have checked the fuses under the hood and under the dash and all good. I replaced the plug thinking that was the problem and nope still not working. I used another truck and all the lights work, any ideas ? thanks

 

Did you replace your interior lights with LED’s by chance? Sometimes, believe it or not, that throws the trailer lighting off…..try replacing the interior lights with the oem bulbs and see if your problems persist. You should also check all of your grounds and clean thoroughly

 

no I haven put LED's in, this is driving me crazy but thank you

 

Even if the fuses look ok you may want to check continuity; sometimes they can look fine but be bad. Might be worth testing new good fuses with the ones that coincide with trailer wiring