neg wire to air conditioner fuse not sending signal so compressor won't start

.I've been fighting this for awhile I bought Van used..A/C was working intermittently then I noticed the pulley stopped engaging...first I had the system recharged it had no noticeable leaks and it worked for a week then it slowly stopped engaging..Took it back they recharged it again it worked for a week..slowly took longer and longer for pulley to engage then it stopped..took it back and again no signification pressure loss.The a/c guy said it was the a/c enable fuse that wasn't grounded..Might be CPU problem?? So he jumped it and pulley engaged it worked so he found the ground wire in the harness under fuse box..cut it high and reconnected in lower and it worked for a week...then it stopped??? .I will try to replace both relays tomorrow...if that doesn't work I'm stumped..I read they have electrical issues and thought I'd try this..Before I go out looking for parts I don't know if I really need..lol Thank you for responding to this problem!

There are no grounds going to the fuse box. What he most likely did was give power to the a/c clutch. The guy sounds like a hack that chopped into your wire harness. Your vehicle needs proper diagnosis.