I had troubles the first time I tried trunking the OGE EDACS system. Basically, I went through and made sure my bank was set to EDACS. Then the channels (780XLT) and then if you haven't programmed any ID's in, then make sure you're in search mode. You might take another look at the user's manual again, and start over.
You might also give a better explanation of your problem. Is it stopping on the Control Channel when you're in scan mode? Does it actually trunk the system and you don't hear any activity or see any ID's show up?
foster_006