Hi there long story short i have a fiat bravo 2010 plate 2.0 multijet sport. My engine compartment fuse box caught on fire on the motorway abroad. I have been able to find a new fuse box and have spliced the good cables to the new fuse box. I have the fusebox that has the battery connector on the top corner. But car won't start. It feels like it wants to just isn't making the circuit. And if i put my full beams on or i put the car in reverse all that happens is my horn just keeps going. Please can anyone help me please.

You need a new wiring loom or let an auto electrician work his magic. You might be lucky and only need the engine bay loom.

Where are you based in the uk?