sounds like a short in one of the wires upon reassembling the lower half you probably somewhere cut into or stripped a wire creating a short my sugestion would be unless you have electrical savy get it to a gundoc ASAP and dont test anymore fuses till the issue is fixed..
Oh yeah and please dont attempt to fix it with electrical tape it will just make things worse the next time around........trust me i have seen this done.
__________________
|