Didn’t have the snap on connector when I borrowed the Solus. Hooked 12v to that connector for the 2500 and it can’t communicate with the computer either. Injectors, fuel pump relay and no scanner communication make me think it’s computer unless I’m missing something. Is there anyway to test the computer without a scanner? Probably not but if there is I’ll give it a shot before I order another.LOOK at the side of your GM1 connector. There's a port for the power adapter you'll need.