To check the blower motor out, you need to unplug the connector that plugs into the blower resistor, located on the bottom of the blower housing. The connector has 4 wires that go to the resistor, each one corresponding to a different fan speed. Take your test light, connect it to a good ground source, and with the key on, start with the low speed setting. Touch each wire in the connector with your test light until you find one that makes it light up. If you do, continue on with the next speed setting, repeating the process until you go through all the speeds. If each wire lit up on a different speed, your fan switch is good, and it's time to move on to the resistor. Plug the connector back into the resistor. There are 2 wires coming from the resistor, the hot wire that goes to the blower motor, and the ground wire. Check the ground wire first, making sure that it is secure, and properly grounded. I moved my wire, and fastened it directly to the body, ensuring I had a good ground.