It seems you have electrical wiring problems. if the fuse continues to blow even though all the connections are properly connected, it simply means that there is a 'live' wire that is being touched by a 'ground' wire.
live wire is the wire connected to the positive(+) terminal of your battery. ground wire is the one connected to the negative(-) terminal. the whole body of your truck is connected to the negative terminal, thus the term body ground.
have an electrician trace your wiring connection.
some common causes of faulty wiring are:
1. extreme heat that can melt the insulators of your wiring
2. water that comes in contact with your wiring
3. rats/rodents that eats everything including wirings =)
Check the plug wiring again on the truck. You have a wire crossed , when you hit the lights and it only blows with the trailer, then there is a crossed wire on the truck. What seems to be happening is your sending power to the ground for the trailer. You can check the trailers ground with an ohm meter, then make sure your truck ground matches that pin. You may know this , but green rght turn, yellow is left turn, brown is parking lights, black is brake lights, and white is ground.
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Fuse block inside truck
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Regards, Lee Davidian
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