I hooked up my radio scanner wrong and it smoked?

i have a radio scanner i got at a yard sale and it didn't come with a power cable. so i cut off an old power adapter to plug it in the scanner ( scanner worked when i pluged it in the wall before cutting wire) i hooked it up to my car thinking the lines that looked like the negitive symbol on the one wire was the ground and it smoked..... now it doesn't work.. is it fixible at all because i really really want to listen to the coppers in my car. its a uniden bear tracker