[tower]

Tex, you probably know by now that you shouldn't be cutting any wires, just tapping into them. My service manual shows the reverse light hot leads as being grey and the reverse ground leads as being grey and black. If you are tapped into a green as opposed to grey wire with the DeltaTechs, that is likely the problem. You need a test light or meter to determine where the factory back up bulbs are lacking in reverse (positive or ground). You may have dislodged a ground lead at the bulb or junction block. Before you tap into anything else, you must ascertain that you are hooking into the positive reverse lead (hence the test light.) Once you figure out what's missing (positive or ground) I can help you troubleshoot. When you go to test the factory reverse lamps, pull the bulbs out of the DeltaTechs or disconnect them from the system. They will only confound your testing and GM has a funky habit of pulling grounds through secondary filaments. Good luck!