Civic EG

A few days ago I hit a bumper laying out in the Coronado bridge. I had my car towed to my shop and had an aluminum radiator installed to replace the one that got trashed after the crash. My car has been running fine for a few days until today. Outside my girlfriends house the car would not start. I assumed it was a dead battery even though I did not leave my lights on. I tried jump starting it but nothing. I then checked the voltage with a multimeter and it read 12v. This is exactly what happens:
I put the key in and turn, the fuel pump does not turn on, neither do any of the lights on my dashboard, no fuel light, no battery light, nothing. I know the battery is good because it reads 12v. Is it possibly a wiring issue or a blown fuse? Any help would be much appreciated.

btw, new to the forum. this is my car

92 Civic Si
USDM GSR motor w/JDM transmission (clutch and flywheel unknown)
B16B Cams
Password:JDM short ram intake
Skunk 2 intake manifold
Full APEXi exhaust from headers all the way back
Skunk 2 ECU program (VTEC at 4800 rpm w/ 9000 rpm redline)
Skunk 2 coilovers

I called my mechanic and hes said he has never seen this problem on a Civic but to check the fuses and wire connections, and if that doesn't solve it it could possibly be the ignition switch. Has anyone ever encountered something like this. Any help would be much appreciated.

fuses or something with your ignition switch maybe.