Blower Motor turns off/on intermittently

[2006RAM1500]

Hello, hopefully a simple question for you guys. My blower motor intermittently shuts on and shuts off, hitting a good bump also will effect it. I’ve replaced the blower motor, the resistor, checked the fuse as well as the connections to the motor/resistor, all seem fine. I’ve read about the ignition switch but not too deep. Not sure where to head next, any suggestions?

 

[jcsmith]

I had the same problem . Turned out to be the ignition switch . Apparently a bad design. The contacts get burnt over time. I replaced the switch , which cured the problem , but the wiring harness plug was burnt also so the problem is back. Not getting a tight connection. So I will put a relay in for the fan switch. The fan contacts were the only ones that got burnt on my switch.