Howdo I narrow down whether its the resistor or the speed control swit

Howdo I narrow down whether its the resistor or the speed control swit I have power to the motor. And have checked it with voltmeter. Replaced the resistor. No luck there so I checked the speed control switch and it is melted a little on the connector and there isn't any resistance on the switch. I tried jumping the switch but nothing happened there either. So now I want to check the connector on the resistor. However I can't find an help with that.