Do you have any Idea why my headlights interior lights and horn does not work?

I have a 87 chevrolet caprice, while replacing the flywheel last night the mechanic forgot to disconnect the battery, and when tightening the transmission bolts two wires from the starter touched creating a big spark.

After removing car from jack stands the car cranks and runs fine but I do not have any headlights, dash lights, radio or horn.

What could be the problem? Thanks.