Electrical problems

[86cobra]

I recently put a new heater core in my 86 mustang and i had to take my light switch out to pull the dash.after putting the dash back on i plugged my light switch back up then something sparked,now i have no panel lights,tail lights or marker lights and my gas and temp. guages dosen't work.all the fuses are good and all my bulbs are good.does anyone no the problem.

[Thierry]

That's what happens when you work on an electrical component with the battery still connected
If your fuses are good there is good chances you'll have to replace your printed circuit board or if you are lucky it may be a burnt wire.