Doug:
Check this trouble shooting guide out... (thanks to Bob and ERA for making such a wonderful step by step guide for us!)
http://www.erareplicas.com/427man/wiring/sigtrouble.htm
Also make sure your ground is good. The front and rear signals are on separate wire looms. Make sure the bullet male connectors do indeed have a good connection. You may have to slightly tighten the crimp on the female barrel.