Radio swap, now truck wont start

[j.marcum614]

Alright, well I just got a 98 ram 1500. I took the system out of my 94 so I could put it in the 98. It all hooked up the same except one wire. The 94 has a ground with a circle ring on the end the goes to the screw in the back of my stereo. But the 98 has(what I assume is the ground) a clip(kinda, looks like a clip, but doesnt actually clip) that slides onto an arm that sticks out the back of the factory radio case.(looks somthing like this """"\____/"""" The low part being the back of the radio and the high being the arms) So anyways, I just cut the end of the supposed ground and wrapped it around the screw on the new radio. Radio works good, amp comes on and the subs bump. But then when I Try to start the car all I get is the constant clicking sound. Sounds like the battery is dead, just louder. I tested the battery and im getting a solid 11.5v. I unhooked the stereo and it didnt change anything. I checked the ignition, radio and engine fuses in the cab(check the rest tomorrow) but they was all good. The only thing I can think of is that wire I cut being part of the anti-theft, but im just spit-balling. Well thanks in advance for all yalls help and I really hope to figure this out soon. Be nice to actually be able to drive my truck!!!