I concur with Robyn, that connector on my 95 model is the clutch connector. If you have not someone before you may have replaced the clutch hub and put it on upside down. I would check the circumference of the clutch hub for that connector.
Mike
1995 Suburban K2500 6.5TD 3.73's Innercooled, Updated cooling, Banks 3" exhaust no gizzards in the kittie. Pyro/Boost/Trans temp. Transgo HD valvebody kit.
2002 2500HD, CC, LB, 4X4,California Truck, Federal Emissions Front pipe, Plugged recirculator, modified air box(Per Kennedy's page) 6" RCD lift, 35" tires.