hi guys,
i have started to have a problem with the lights on my truck. my headlights have stopped working, the rear lights, front parking lights, turn signals and dash lights work but not the headlights, i also keep getting a fuse blow stopping all the above from working along with the horn! any ideas what might be the cause.
the wiring has been messed with and i have had to re-wire some of it. could it be the light switch or dimmer?

thanks

bill.