I am having trouble with the blower motor not running on my 2009 Ford F150. I have replaced the blower motor resistor, the blower motor resistor connecter, and the blower motor. It has worked intermittently, but just for a short period of time. I am trying to locate where the ground wire for the blower motor connects to the body/frame.

 

Manual or automatic climate control?

Why do you think you have an ground problem?

Other than swapping parts, have you done any actual troubleshooting?

 

Automatic climate control.

I have a friend, who is a mechanic, troubleshoot the issue. He found 12 volts are getting to the blower motor. He suggested I research where the ground is connected.

 

The ground for the blower motor is switched through the blower speed control module (under the control of the DATC module) then goes to ground connection G203 which is somewhere around the base of the firewall above and behind the accelerator pedal to the right of where the steering shaft goes through the firewall.. Sorry, but the manual isn't any more clear than that.