Yesterday I replaced the ac blower resistor on my 02 jeep liberty sport. At first the blower wouldn't work on any speed 123 or 4. When I put my test light to the two prong connector at the motor (on the hot side ) to see if it was getting power my test light came on and the blower began working. Today it ran for a while but now doesn't run on any speed. I put my test light on the blower motor connector again , "at the motor" and it started working again on any speed I set it on like it should. 2 Hours later it has stopped again. Any ideas ??