jedsus

My black up light wasn't working so i changed the fuse and i think i put a 30 amp wen it was supp... tobe like a 7.5 or a 15...The car was running and then 1 of the wire started to smoke and then the car dies.....I took out the fuse and it still dosen't want to turn on.... The wire is still there...it did'nt broke off or any e thing it melted the color of the wire....it was a yellow wire with a red line behine the fuse box in the car.......any help to what this wire might be?