Blower motor problems

Hey guys,
My blower motor stopped working a few days ago. I replaced it and now the new one only works on high. It does work at all low or medium. Anyone know what the problem is? Thanks!

 

Yes, it's the resistor, or the plug to it.

In every normal resistor setup I'm aware of (not counting fancy newer electronically controlled systems) the fan switch on high bypasses the resistor, and feeds full voltage to the blower. So even if the resistor completely fails, you still get the high setting.

 

Pull the resistor connector and look at the four pins. One may look burnt. If so, it can be removed from the connector; use fine sandpaper to clean the terminal and put dielectric grease on the terminals when reconnecting the connector. Do same to the blower connector.