Outer Limits 4x4 Board

aircon in my gq keeps blowing fuses. noticed it wasn't working so checked the fuse when i put the new one in it blew straight away. thought it may be because the ignition was on so i turned it off and put the fuse in and it blew straight away as well.

pulled the dash switch out and it looks fine. followed the wires around the compressor as far as i could and couldnt find a short.

anyone had this happen or got any ideas where to start?

thanks