My son just swapped motors in his 2003 Mustang 3.8.He tried to crank it and it did nothing previously all the inside things functioned, now the only thing that should when you turn the key is the theft alarm thing. No lights no dash no nothing. Did he trip something? Help please

 

The anti theft light blinks and it makes a clicking noise under the dash, if you hit the brake it will make the clicking noise start

 

You realize there's like 1,000 things that could potentially be wrong. The EASIEST to diagnose are: 1. is the battery charged? 2. is the battery grounded to the frame, and the frame to the motor? If yes and yes... TOW TO DEALER. Good luck.