The two wires on the back are high pressure cut out (required for R-134) and the front wires are for clutch engagement. The cycle switch is on the reciever drier (The big can next to the fire wall).
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.