i need help installing amp

first i hope this is in the right fourm

ok tonite i dont know what i was thinking, i must of had my head up my butt..........anyway, my brother and i were trying to intall his wiring kit for his amp. the previous owners of his car, did not care for it and bought the wrong group battery for it, this put the terminals in the front of the battery. so in my all non-exsistent brillance tonite i decided to turn the battery around. TOTTALY forgetting that the terminals moved also, so i put the positive on the neg terminal, and then try to put the neg on.....horn honks, think nothing of it, try again, horn honks, then i look........blew the fuse for the raido (fixed), blew the circuit breaker for the power windows (fixed)......and the one that has me all sorts of confused, the wipers will start going with the key in any "on" postion, acc, etc.....................fuse is fine, motor must obviously be fine..............couldnt find a fuse under the hood............anyone have any help?????????????

aight its a 2000 neon..............the car runs fine, just the wipers is the only thing screwed up right now