HELP! Won't start

Hey guys any help would be appreciated. I bought a new used heater bezel so I took the old one out, I figured since I had that out I would take the speedo bezel out to assist with putting a new radio in.
So I have the speedometers bezel and radio/heater bezel out. I ran a power wire to the new radio and a ground,got nothing so I ran a wire from the positive post and a negative to the negative post to check the radio and it came on.
Now the part I need helpl with I have everything still out and when I went to turn the key .....nothing. what did I do?
Please any he'll would be great
Thanks
Frank