Randall, are you saying you need the wiring diagram? The closest available in the club’s Coach Assist section is for a ‘96 and ‘02-03 Patriots. But even so, and even if your specific engine is shown, diagrams typically show how things are connected but not where to actually locate wires and connections.
It’s likely someone here can advise you, but they’ll need a little more information, such as what symptoms are indicating a broken ground, why you mentioned the ECM, and any other detail that will help them point you in the right direction. 🙂
Joel