Alright, so my 03 coupe had an insane parasitic battery drain that was being caused by the AC compressor clutch (?) staying constantly engaged. I could hear it clicking open any time the battery got power so I unplugged it and the battery drain went away.

This car was purchased with a blown motor for a very low price and recently got a low mile used engine swapped into it, which came with a different AC compressor than the one that was already on the car before the motor swap. While in the process of trying to locate the issue I asked the previous owner and he said that issue was also present when he had it and a shop told him to replace the compressor.

Now obviously it's unlikely replacing the compressor would solve my issue given it has technically been replaced but with that said, where do I even begin with trying to track the source of the issue so I can have AC without having to unplug the compressor every time I get out of the car?