Hey y’all,

I have a 2010 Ford F150 Lariat and I keep having problems with my Blower Motor Resistor. My original one that came with the truck burned out, on the resistor there was a burnt mark on one of the prongs along with the harness as well. I replaced both a year and a half ago and tonight I just had to replace the blower motor resistor again. Same thing, the resistor had a burnt mark on one of the four prongs again but the harness is fine. I do not know what the problem could be other than a wire shorting out. Has anyone else had this problem?

 

There's been lots of blower resistor problems. Wire shorting out seems likely. I'm going to beat Maxx here and recommend applying dielectric grease to that connector when you put in new parts.

 

the guy at advance auto gave me some to put on it, the harness that I bought a year and a half ago had dielectric grease already on it and it still burned out

 

There must be something between the module and the resistor where the wire has issues. I haven't had the problem (yet), but it's really common.

 

thats what I fear and I don’t even know where to start to trace back a wire without ripping open all taped wire looms and what not

 

I don't have diagrams for 2010, only 11+. Not sure if they are the same.

 

I appreciate it!

 

You should measure the amp draw of the blower motor while running on high to be sure its in spec also. It could be starting to go.

 

If the resistor is buring out repeatedly, its a sign that the blower motor itself is failing and pulling extra amps through the circuit. replacing the blower motor should fix the issue.

 

I have to try that although I’m not very savvy with multimeters