Duramax LB7 Coolant Flow Diagram?

Hey does anyone have a coolant flow diagram for an LB7 duramax? I'm looking at installing a kats circulating coolant heater (tank heater) and would like to know the proper routing to efficiently heat the engine. The plug in supplied from the factory reads open with a multimeter and does not work. I haven't called a dealer yet but presume its replacement would be prohibitively expensive. I hate getting into a cold, smoking diesel in the morning following those subzero nights in Minnesota.:confused: