So I am new to the forums, but not new to forums in general. I've been searching for A/C compressor faults similar to mine but i realize I may never find one EXACTLY like mine so here goes. Bare with me guys....

A year or two or three ago while replacing the battery, I locked the keys in the trunk, I got the bright idea to power the car with the battery hooked up to the engine and the chassis Ever since then the A/C hasn't worked.
Since then i've checked ALL fuses (audible multimeters are awesome) and I made sure the A/C compressor relay was working (swapped with horn relay).

the blower works, and I don't think it's the heater valve because it doesn't blow HOT air on the lo temp setting.

I switched out the compressor under my father's orders, to no avail, and the compressor does not kick on even after I added a decent charge (about 42 psi on a 96F day.)

Obviously i shorted something out that fateful day but what?? I'm at my wits end.

Also if someone could guide me through the JTIS download site, that'd be great

 

i'd like to add the vehicle is a 2000 jaguar s-type with the 4.0L V8