If I remember correctly you need to wire the purple from the compressor to the switch and the black to a ground from plug 2 and the plug 1 gets ran to the battery.
I got mine on February 20th and as of yesterday it will not stay connected to the phones Bluetooth. It will connect and disconnect over and over, hopefully there is a fix for this.
I would highly recommend getting this one for a hitch extension to use with bike racks. I have had one since 2016 and I would never go back to a normal floppy one.
Advantage Adjustable 11-Inch Hitch Extension...
If you are going to do rattle cans get one if those plastic trigger things. Also this grill is metal so you don't have to worry about plastic additives in the paint.