Excessive parasitic draw?

If the van sits for more than a couple of days with the battery connected it completely drains the battery. I've ruined one new battery. I did the amperage test by putting my multimeter in line with the battery negative and pulling fuses one by one. Nothing made a difference in the reading. When I disconnected the positive cable from the TIPM my reading dropped. The original reading was around.7 amp. I reconnected the positive cable and started pulling connectors off the TIPM. When I pulled C7 the amperage dropped again. I'm thinking my draw is happening in the circuits supplied by C7 but I can't seem to find a wiring diagram showing me where the wires go from C7. Can you please help me?