A/C compressor not receiving power

So I had my car parked for about a week, battery was bad so I replaced it, after replacing the battery my compressor doesn't seem to be receiving energy, got it to turn on by running it straight to my amplifier switch. so I know the the clutch or compressor are still good. I don't want to have to turn on my amplifier just to get the A/C going. I was wondering/hoping it could be a fuse or maybe something besides the evap sensor, if it is the evap would I be able to leave the clutch strait connected with my amp?