Ac compressor not coming on
 

So this is is what I've got 2001 cummins pretty much stock straight pipe 4 inch pipe edge attitude well went to turn on ac and nothing checked freon there's freon in there have power at the fuse box but no power at the plug with ac on what else should I be looking for?

It's ether too low or overcharged would be where I would start

I guess I could suck it all out and start all over with fresh

I would first