1967 Chevy Camaro Car wont start

I have a 1967 Camaro and I need your help. I changed out the A.C. Generator to the standard alternator system. I followed the instruction to a Tee. Everything went well and the car was charging and running just fine. I just bought a new set of after market gauges. I hook up the oil sending unit and the temp sending unit. I was going to hook up the voltage gauge wire and I was going to run that wire form the positive stud on the alternator. I went to loosen up the nut and the whole stud turned and now I have no power to start the car. COULD THIS BE MY PROBLEM? WOULD THIS PROVENT MY CAR FROM STARTING? Do you think that I should go back to the old system, just to test the system? How do I go about troubleshooting the system? Please get back with me. Do you have a telephone number that I can reach you at? My number is (254)319-8774. Thank you, Rory