Wiring of thermostats?

We replaced the felt bearing on the tumble dryer. Do not know how the wires are connected to the thermofuse and thermostats. Machine is not heating up. Thermofuse and element have been replaced. Thermostats have been checked and they are fine. Ther is a grey and white wire coming from the switch that differenciates between hot and warm and then there are two blue wires and two black wires.