R134 Conversion Done - No Compressor Engagement?

[Cummmins]

Hi. I just got done with my R134 a/c conversion. Pressures and temps are perfect. BUT, the a/c compressor will not turn on with the climate control. I have to hot wire the compressor to get the system to work. There is no power at the compressor connector. The temp sensor on the dryer is turning on the fan. The low pressure switch is closed. I have the climate control set to the coldest setting (i can hear it make some kind of sounds when i do this), and the button pushed with the up and down arrows both filled in. I also have the fan on high. What is the best way to go about diagnosing this system from where I am at? Any relevant help would be appreciated!