I REALLY need help!!

[caballosnegros]

Don't know what to do anymore so I decided to see if someone out on the net could help.
I have a 2003 Silverado 2500 4x4. There was an electrical recall, I took it in, had my horse trailer attached. After they did some work, I go to leave and the trailer electrical was not working. They fixed that, no problem. Come winter, I attach the plow and one day I fin out I don't have plow head lights. (They had been working before the electrical "fix"). I get those fixed, go to drop the plow, and find I have no truck headlights. The dealership says it was not their fault that they fixed the trailer lights as a service (right, had them going in, come out after they monkey with it and it was not their fault).
Anyone have any ideas or heard of this before?? I really would appreciate any advice !!! Thank you!!

[J-Ri]

Check the headlight fuse. If blown, replace and see if your truck headlights work. If they come on, connect the plow and see if the fuse blows. If it does, check the plow wiring for shorts.