How about friends I am new in the forum

A cordial greeting from Mexico, I have problems with the electrical system of my FIRS 2006 party, the fuses of the lights of the headlights are melted, my alarm no longer works and I believe that everything started with a lighthouse that had a filter and accumulate a considerable amount of water, it is already sealed and completely dry.
How can I repair this fault?
I hope to have your appreciable help, in advance thanks.

You must check that no cable has burned, and therefore this causing a short circuit that would be trying to burn the fuses.

Thank you friend for your ardent help, already check the cables and none is burned, I simply do not have to run that feed the high filament and neither is my fuse burned, and as my alarm commented you does not work.