Finished wiring but then!!!!

[Xtreme Cartz]

I was able to work on it this weekend and got it all wired up and ready to go. Earlier today I didn't have the radiator hoses or fuel lines hooked up yet but I just wanted to see if the starter and fan worked. They did so I continued on installing the radiator hoses and filling it up with coolant. After that I tried to fire it up. I let the electric fuel pump fill up the lines and carb then attempted to start the engine. It turned over good a few times but wouldn't fire. I try again with the choke and suddenly it quits turning over. Now everything is dead. I have the fan on a seperate switch and it won't even turn on.
All the fuses appear to be fine. I went over all the wires and none of them came loose. So I decided it must be a dead battery which is brand new. I tried jumping it but still nothing. Any ideas what could be wrong? Seems like there isn't that much to go wrong.
Biggest clue would be the fan right? Because it's on a seperate switch that goes straight to the battery. If that's not working it must be the battery I think. Please help!!! Thanks