2001 Grand Cherokeeg AC issue

I think they mean low readings on the high and low sides. Negative is a vacuum. Anyway, if the compressor kicks in, you have some refrigerant in the system and the components are all there and working. Get those wires fixed and get the charge topped off correctly using gauges. I think it will then run okay based on what you said. Watch how it's done and any shade tree mechanic can do it himself next time. That's how I learned 30 years ago using R12, now it's 134a. It's not rocket science.