I have a 2010 Dodge Grand Caravan and have no blower operation on high speed. I can't seem to find a wiring schematic for this system anywhere. If anyone has any suggestions where to start looking or where to find a schematic it would be a great help.

 

Well I can send you a diagram for a 2008 if you give me an email address. Same generation van but there may be differences. If it's the same as an 08 the most likely cause is the blower control module.

 

well, I am going to say you are most likely going to need a A/C control head.
You know your fuse, motor, and resistors are good because it works on various speed. And it is very unlikely you have a broken wire between the motor and control head.

But I think you would rather just live without high speed...